-Network: (11 - Statement - Statement Of Financial Position Unclassified - Securities Based Operations)

-Statement of Financial Position [Abstract] {ID1}

-Statement [Table] {ID2}

-Statement [Line Items] {ID3}

-Assets {ID4}

Cash and cash equivalents {ID5}

Accounts receivable {ID6}

Due from related parties {ID7}

Investments {ID8}

Separate account assets {ID9}

Deferred mutual fund sales commissions, net {ID10}

Property and equipment (net of accumulated depreciation of $295 at June 30, 2009 and $259 at December 31, 2008) {ID11}

Intangible assets (net of accumulated amortization of $396 at June 30, 2009 and $324 at December 31, 2008) {ID12}

Goodwill {ID13}

Other assets {ID14}

Total assets {ID15}

-Liabilities {ID16}

Accrued compensation and benefits {ID17}

Accounts payable and accrued liabilities {ID18}

Due to related parties {ID19}

Short-term borrowings {ID20}

Convertible debentures {ID21}

Long-term borrowings {ID22}

Separate account liabilities {ID23}

Deferred tax liabilities {ID24}

Other liabilities {ID25}

Total liabilities {ID26}

Commitments and contingencies (Note 12) {ID27}

-Temporary equity {ID28}

Redeemable non-controlling interests {ID29}

Convertible debentures {ID30}

Total temporary equity {ID31}

-Permanent Equity {ID32}

-BlackRock, Inc. stockholders' equity {ID33}

Common stock, $0.01 par value; Shares authorized: 500,000,000 at June 30, 2009 and December 31, 2008; Shares issued: 50,826,457 at June 30, 2009 and 118,573,367 at December 31, 2008; Shares outstanding: 49,915,191 at June 30, 2009 and 117,291,110 at December 31, 2008 {ID34}

Preferred stock (Note 11) {ID35}

Additional paid-in capital {ID36}

Retained earnings {ID37}

Accumulated other comprehensive (loss) {ID38}

Escrow shares, common, at cost (911,266 shares held at June 30, 2009 and December 31, 2008) {ID39}

Treasury stock, common, at cost (0 and 370,991 shares held at June 30, 2009 and December 31, 2008, respectively) {ID40}

Total BlackRock, Inc. stockholders' equity {ID41}

Nonredeemable non-controlling interests {ID42}

Total permanent equity {ID43}

Total liabilities, temporary equity and permanent equity {ID44}

-Network: (12 - Statement - Statement Of Financial Position Unclassified - Securities Based Operations (Parenthetical))

-Statement of Financial Position [Abstract] {ID45}

-Statement [Table] {ID46}

-Statement [Line Items] {ID47}

Property and equipment, accumulated depreciation {ID48}

Intangible assets, accumulated amortization {ID49}

Common stock, par value {ID50}

Common stock, shares authorized {ID51}

Common stock, shares issued {ID52}

Common stock, shares outstanding {ID53}

Escrow shares, common shares {ID54}

Treasury stock, shares {ID55}

-Network: (13 - Statement - Statement Of Income Securities Based Income)

-Income Statement [Abstract] {ID56}

-Statement [Table] {ID57}

-Statement [Line Items] {ID58}

-Revenue {ID59}

-Investment advisory and administration base fees {ID60}

Related parties {ID61}

Other third parties {ID62}

Investment advisory performance fees {ID63}

Investment advisory and administration base and performance fees {ID64}

BlackRock Solutions and advisory {ID65}

Distribution fees {ID66}

Other revenue {ID67}

Total revenue {ID68}

-Expenses {ID69}

Employee compensation and benefits {ID70}

-Portfolio administration and servicing costs {ID71}

Related parties {ID72}

Other third parties {ID73}

Amortization of deferred mutual fund sales commissions {ID74}

General and administration {ID75}

Restructuring charges {ID76}

Amortization of intangible assets {ID77}

Total expenses {ID78}

Operating income {ID79}

-Non-operating income (expense) {ID80}

Net gain (loss) on investments {ID81}

Interest and dividend income {ID82}

Interest expense {ID83}

Total non-operating income (expense) {ID84}

Income before income taxes {ID85}

Income tax expense {ID86}

Net income {ID87}

Less: Net income (loss) attributable to redeemable non-controlling interests {ID88}

Net income (loss) attributable to nonredeemable non-controlling interests {ID89}

Net income attributable to BlackRock, Inc. {ID90}

-Earnings per share attributable to BlackRock, Inc. common stockholders: {ID91}

Basic {ID92}

Diluted {ID93}

Cash dividends declared and paid per share {ID94}

-Weighted-average common shares outstanding: {ID95}

Basic {ID96}

Diluted {ID97}

-Network: (14 - Statement - Statement Of Other Comprehensive Income)

-Statement of Income and Comprehensive Income [Abstract] {ID98}

-Statement [Table] {ID99}

-Statement [Line Items] {ID100}

Net income {ID101}

-Other comprehensive income: {ID102}

Change in net unrealized gain (loss) from available-for-sale investments, net of tax {ID103}

Minimum pension liability adjustment {ID104}

Foreign currency translation adjustments {ID105}

Comprehensive income attributable to BlackRock, Inc. {ID106}

-Network: (15 - Statement - Statement Of Shareholders Equity And Other Comprehensive Income)

-Statement of Stockholders' Equity [Abstract] {ID107}

-Statement [Table] {ID108}

-Statement, Equity Components [Axis] {ID109}

-Equity Component [Domain] {ID110}

Common And Preferred Stock {ID111}

Additional Paid-in Capital {ID112}

Retained Earnings {ID113}

Accumulated Other Comprehensive Income (Loss) {ID114}

Common Shares Held In Escrow {ID115}

Treasury Stock Common {ID116}

Total Stockholders' Equity {ID117}

Nonredeemable Non-controlling Interests {ID118}

Redeemable Non-controlling Interests (Temporary Equity) {ID119}

-Statement [Line Items] {ID120}

Stockholders Equity Statement Abstract {ID121}

Beginning Balance, as reported {ID122}

January 1, 2009 initial recognition of APB 14-1, SFAS No. 160 and EITF Topic No. D-98 {ID123}

Beginning Balance, as adjusted {ID124}

Reclass to temporary equity - convertible debt {ID125}

Net income {ID126}

Dividends paid, net of dividend expense for unvested RSUs {ID127}

Release of common stock from escrow agent in connection with Quellos Transaction {ID128}

Stock-based compensation {ID129}

Issuance of common shares to institutional investor {ID130}

Issuance of common shares for contingent consideration {ID131}

Net issuance of common shares related to employee stock transactions {ID132}

PNC capital contribution {ID133}

Net tax benefit from stock-based awards {ID134}

Minimum pension liability adjustment {ID135}

Subscriptions/(redemptions/distributions) - non-controlling interest holders {ID136}

Deconsolidation of sponsored investment funds {ID137}

Foreign currency translation adjustments {ID138}

Other changes in non-controlling interests {ID139}

Change in net unrealized gain (loss) from available-for sale investments, net of tax {ID140}

Ending Balance {ID141}

-Network: (16 - Statement - Statement Of Cash Flows Indirect Securities Based Operations)

-Statement of Cash Flows [Abstract] {ID142}

-Statement [Table] {ID143}

-Statement [Line Items] {ID144}

-Cash flows from operating activities {ID145}

Net income {ID146}

-Adjustments to reconcile net income to cash from operating activities: {ID147}

Depreciation and other amortization {ID148}

Amortization of deferred mutual fund sales commissions {ID149}

Stock-based compensation {ID150}

Deferred income tax expense (benefit) {ID151}

Net gains (losses) on non-trading investments {ID152}

Purchases of other investments within consolidated funds {ID153}

Proceeds from sales and maturities of other investments within consolidated funds {ID154}

(Earnings) losses from equity method investees {ID155}

Distributions of earnings from equity method investees {ID156}

Other adjustments {ID157}

-Changes in operating assets and liabilities: {ID158}

Accounts receivable {ID159}

Due from related parties {ID160}

Deferred mutual fund sales commissions {ID161}

Investments, trading {ID162}

Other assets {ID163}

Accrued compensation and benefits {ID164}

Accounts payable and accrued liabilities {ID165}

Due to related parties {ID166}

Other liabilities {ID167}

Cash flows from operating activities {ID168}

-Cash flows from investing activities {ID169}

Purchases of investments {ID170}

Purchases of assets held for sale {ID171}

Proceeds from sales and maturities of investments {ID172}

Return of capital from equity method investees {ID173}

Net consolidations (deconsolidations) of sponsored investment funds {ID174}

Contingent/other acquisition payments {ID175}

Purchases of property and equipment {ID176}

Proceeds from other investing activities {ID177}

Cash flows from investing activities {ID178}

-Cash flows from financing activities {ID179}

Repayment of long-term borrowings {ID180}

Repayment of short-term borrowings {ID181}

Proceeds from short-term borrowings {ID182}

Cash dividends paid {ID183}

Proceeds from stock options exercised {ID184}

Proceeds from issuance of common stock {ID185}

Repurchases of common stock {ID186}

Net (redemptions/distributions paid)/ subscriptions received from non-controlling interest holders {ID187}

Excess tax benefit from stock-based compensation {ID188}

Net borrowings/ (repayment of borrowings) by consolidated sponsored investment funds {ID189}

Cash flows from financing activities {ID190}

Effect of exchange rate changes on cash and cash equivalents {ID191}

Net increase (decrease) in cash and cash equivalents {ID192}

Cash and cash equivalents, beginning of period {ID193}

Cash and cash equivalents, end of period {ID194}

-Supplemental cash flow information: {ID195}

Cash paid for interest {ID196}

Cash paid for income taxes {ID197}

-Supplemental non-cash investing and financing activities: {ID198}

Issuance of common stock {ID199}

Contingent common stock payment related to Quellos transaction {ID200}

-Network: (17 - Disclosure - Notes to Financial Statements)

-Notes to Financial Statements [Abstract] {ID201}

1.Significant Accounting Policies {ID202}

2.Investments {ID203}

3.Fair Value Disclosures {ID204}

4.Variable Interest Entities (VIEs) {ID205}

5.Derivatives and Hedging {ID206}

6.Goodwill {ID207}

7.Intangible Assets {ID208}

8.Borrowings {ID209}

9.Related Party Transactions {ID210}

10.Restructuring Charges {ID211}

11.Capital Stock {ID212}

12.Commitments and Contingencies {ID213}

13.Stock-Based Compensation {ID214}

14.Earnings Per Share {ID215}

15.Segment Information {ID216}

16.Pending Transaction {ID217}

17.Subsequent Events {ID218}

-Network: (18 - Disclosure - Document Information)

-Document Information [Text Block] {ID219}

Document Type {ID220}

Amendment Flag {ID221}

Amendment Description {ID222}

Document Period End Date {ID223}

-Network: (19 - Disclosure - Entity Information)

-Entity [Text Block] {ID224}

Trading Symbol {ID225}

Entity Registrant Name {ID226}

Entity Central Index Key {ID227}

Current Fiscal Year End Date {ID228}

Entity Well-known Seasoned Issuer {ID229}

Entity Current Reporting Status {ID230}

Entity Voluntary Filers {ID231}

Entity Filer Category {ID232}

Entity Common Stock, Shares Outstanding {ID233}

Entity Public Float {ID234}

BlackRock Inc. XBRL Taxonomy Presentation Networks