| Entity Registrant Name | INTERNATIONAL BUSINESS MACHINES CORP |
| CIK | 0000051143 |
| Accession number | 0001047469-14-001302 |
| Link to XBRL instance | http://www.sec.gov/Archives/edgar/data/51143/000104746914001302/ibm-20131231.xml |
| Fiscal year end | --12-31 |
| Fiscal year focus | 2013 |
| Fiscal period focus | FY |
| Current balance sheet date | 2013-12-31 |
| Current year-to-date income statement start date | 2013-01-01 |
| Commentary | Conforms with all rules. |
| Level 3 Text Block concept | us-gaap:ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock |
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Level 4 Details Key Concepts: Deferred tax assets (liabilities)
| Description | Fact value | US GAAP XBRL Concept |
|---|---|---|
| Deferred tax assets, gross | 10,311,000,000 | us-gaap:DeferredTaxAssetsGross |
| Valuation allowance | -734,000,000 | us-gaap:DeferredTaxAssetsValuationAllowance |
| Deferred tax assets, net | 9,577,000,000 | us-gaap:DeferredTaxAssetsNet |
| Deferred tax liabilities | -6,680,000,000 | us-gaap:DeferredIncomeTaxLiabilities |
| Deferred tax assets (liabilities), net | 2,897,000,000 | |
| CHECK | 0 |
(Classified balance sheet) Deferred tax assets (liabilities), net components current/noncurrent asset/liability
| Description | Fact value | US GAAP XBRL Concept |
|---|---|---|
| Deferred tax assets, net, current | 1,651,000,000 | us-gaap:DeferredTaxAssetsNetCurrent |
| Deferred tax assets, net, noncurrent | 3,051,000,000 | us-gaap:DeferredTaxAssetsNetNoncurrent |
| Deferred tax liabilities, net, current | 0 | |
| Deferred tax liabilities, net, noncurrent | -1,741,000,000 | us-gaap:DeferredIncomeTaxLiabilities |
| Deferred tax assets (liabilities), net | 2,897,000,000 | |
| CHECK | 0 |
(Unclassified balance sheet) Deferred tax assets (liabilities), net components asset/liability
| Description | Fact value | US GAAP XBRL Concept |
|---|---|---|
| Deferred tax assets | 9,577,000,000 | us-gaap:DeferredTaxAssetsNetCurrent |
| Deferred tax liabilities, net | -6,680,000,000 | us-gaap:DeferredIncomeTaxLiabilities |
| Deferred tax assets (liabilities), net | 2,897,000,000 | |
| CHECK | 0 |
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