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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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| Intangible Assets [Abstract] | ||||||||||
| Gross Carrying Value | $ 17,666,000,000 | [1] | $ 17,666,000,000 | [1] | $ 18,977,000,000 | [1] | ||||
| Accumulated Amortization | 10,331,000,000 | [1] | 10,331,000,000 | [1] | 10,956,000,000 | [1] | ||||
| In Text Details [Abstract] | ||||||||||
| Amortization of intangibles | 321,000,000 | 382,000,000 | 640,000,000 | 767,000,000 | ||||||
| Future Amortization Expense, Remainder of 2012 | 315,000,000 | |||||||||
| Future Amortization Expense, 2013 | 1,100,000,000 | |||||||||
| Future Amortization Expense, 2014 | 950,000,000 | |||||||||
| Future Amortization Expense, 2015 | 870,000,000 | |||||||||
| Future Amortization Expense, 2016 | 770,000,000 | |||||||||
| Future Amortization Expense, 2017 | 670,000,000 | |||||||||
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Purchased credit card relationships [Member]
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| Intangible Assets [Abstract] | ||||||||||
| Gross Carrying Value | 6,148,000,000 | [1] | 6,148,000,000 | [1] | 6,948,000,000 | [1] | ||||
| Accumulated Amortization | 4,246,000,000 | [1] | 4,246,000,000 | [1] | 4,775,000,000 | [1] | ||||
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Core Deposits [Member]
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| Intangible Assets [Abstract] | ||||||||||
| Gross Carrying Value | 3,592,000,000 | [1] | 3,592,000,000 | [1] | 3,903,000,000 | [1] | ||||
| Accumulated Amortization | 2,735,000,000 | [1] | 2,735,000,000 | [1] | 2,915,000,000 | [1] | ||||
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Customer Relationships [Member]
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| Intangible Assets [Abstract] | ||||||||||
| Gross Carrying Value | 4,081,000,000 | [1] | 4,081,000,000 | [1] | 4,081,000,000 | [1] | ||||
| Accumulated Amortization | 1,730,000,000 | [1] | 1,730,000,000 | [1] | 1,532,000,000 | [1] | ||||
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Affinity Relationships [Member]
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| Intangible Assets [Abstract] | ||||||||||
| Gross Carrying Value | 1,566,000,000 | [1] | 1,566,000,000 | [1] | 1,569,000,000 | [1] | ||||
| Accumulated Amortization | 1,022,000,000 | [1] | 1,022,000,000 | [1] | 966,000,000 | [1] | ||||
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Other intangibles [Member]
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| Intangible Assets [Abstract] | ||||||||||
| Gross Carrying Value | 2,279,000,000 | [1] | 2,279,000,000 | [1] | 2,476,000,000 | [1] | ||||
| Accumulated Amortization | $ 598,000,000 | [1] | $ 598,000,000 | [1] | $ 768,000,000 | [1] | ||||
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