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2415402 - Disclosure - Accumulated Other Comprehensive Income (Schedule of Changes in Accumulated Other Comprehensive Income (Loss)) (Details)
(http://www.discovercard.com/role/AccumulatedOtherComprehensiveIncomeScheduleOfChangesInAccumulatedOtherComprehensiveIncomeLossDetails)
TableAccumulated Other Comprehensive Income (Loss) [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001393612 (http://www.sec.gov/CIK)
Accumulated Other Comprehensive Income (Loss) [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Statement, Equity Components [Axis]Statement, Equity Components [Axis]Statement, Equity Components [Axis]
Unrealized Gain (Loss) on Available-for-Sale Investment Securities, Net of Tax [Member]Gain (Loss) on Cash Flow Hedges, Net of Tax [Member]Foreign Currency Translation Adjustments, Net of Tax [Member]Pension Plan Loss, Net of Tax [Member]Equity Component [Domain]Unrealized Gain (Loss) on Available-for-Sale Investment Securities, Net of Tax [Member]Gain (Loss) on Cash Flow Hedges, Net of Tax [Member]Foreign Currency Translation Adjustments, Net of Tax [Member]Pension Plan Loss, Net of Tax [Member]Equity Component [Domain]Unrealized Gain (Loss) on Available-for-Sale Investment Securities, Net of Tax [Member]Gain (Loss) on Cash Flow Hedges, Net of Tax [Member]Foreign Currency Translation Adjustments, Net of Tax [Member]Pension Plan Loss, Net of Tax [Member]Equity Component [Domain]
Accumulated other comprehensive income (loss), balance at beginning of period, net of tax
0  
(20,000,000) 
0 1
(140,000,000) 
(160,000,000) 
23,000,000  
(7,000,000) 
0 1
(154,000,000) 
(138,000,000) 
19,000,000  
13,000,000  
1,000,000 1
(101,000,000) 
(68,000,000) 
Net change in accumulated other comprehensive income (loss), net of tax
(3,000,000) 
7,000,000  
0 1
(5,000,000) 
(1,000,000) 
(23,000,000) 
(13,000,000) 
0 1
14,000,000  
(22,000,000) 
4,000,000  
(20,000,000) 
(1,000,000)1
(53,000,000) 
(70,000,000) 
Accumulated other comprehensive income (loss), balance at end of period, net of tax
(3,000,000) 
 
(13,000,000) 
 
0 1
 
(145,000,000) 
 
(161,000,000) 
 
0  
 
(20,000,000) 
 
0 1
 
(140,000,000) 
 
(160,000,000) 
 
23,000,000  
 
(7,000,000) 
 
0 1
 
(154,000,000) 
 
(138,000,000) 
 
1: Includes unrealized gains/losses on hedge of net investment in foreign subsidiary, net of tax benefit and net gains on foreign currency translation adjustments.