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Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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| Intangible Assets [Abstract] | ||||||||
| Gross Carrying Value | $ 15,027 | [1],[2] | $ 17,397 | [1],[2] | ||||
| Accumulated Amortization | 9,690 | [1],[2] | 11,823 | [1],[2] | ||||
| Finite-Lived Intangible Assets, Net | 5,337 | [1],[2] | 5,574 | [1],[2] | ||||
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Purchased credit card relationships [Member]
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| Intangible Assets [Abstract] | ||||||||
| Gross Carrying Value | 5,601 | [1],[2] | 6,160 | [1],[2] | ||||
| Accumulated Amortization | 4,371 | [1],[2] | 4,849 | [1],[2] | ||||
| Finite-Lived Intangible Assets, Net | 1,230 | [1],[2] | 1,311 | [1],[2] | ||||
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Core deposits intangibles [Member]
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| Intangible Assets [Abstract] | ||||||||
| Gross Carrying Value | 1,779 | [1],[2] | 3,592 | [1],[2] | ||||
| Accumulated Amortization | 1,278 | [1],[2] | 3,055 | [1],[2] | ||||
| Finite-Lived Intangible Assets, Net | 501 | [1],[2] | 537 | [1],[2] | ||||
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Customer relationships [Member]
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| Intangible Assets [Abstract] | ||||||||
| Gross Carrying Value | 4,025 | [1],[2] | 4,025 | [1],[2] | ||||
| Accumulated Amortization | 2,372 | [1],[2] | 2,281 | [1],[2] | ||||
| Finite-Lived Intangible Assets, Net | 1,653 | [1],[2] | 1,744 | [1],[2] | ||||
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Affinity relationships [Member]
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| Intangible Assets [Abstract] | ||||||||
| Gross Carrying Value | 1,577 | [1],[2] | 1,575 | [1],[2] | ||||
| Accumulated Amortization | 1,222 | [1],[2] | 1,197 | [1],[2] | ||||
| Finite-Lived Intangible Assets, Net | 355 | [1],[2] | 378 | [1],[2] | ||||
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Other intangibles [Member]
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| Intangible Assets [Abstract] | ||||||||
| Gross Carrying Value | 2,045 | [1],[2] | 2,045 | [1],[2] | ||||
| Accumulated Amortization | 447 | [1],[2] | 441 | [1],[2] | ||||
| Finite-Lived Intangible Assets, Net | $ 1,598 | [1],[2] | $ 1,604 | [1],[2] | ||||
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