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Securitizations and Other Variable Interest Entities - Credit Card (Details) (USD $)
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3 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2014
Consolidated VIEs [Member]
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Dec. 31, 2013
Consolidated VIEs [Member]
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Jun. 30, 2014
Credit Card Receivable [Member]
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Dec. 31, 2013
Credit Card Receivable [Member]
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Jun. 30, 2014
Credit Card Receivable [Member]
Subordinated Debt Securities [Member]
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Jun. 30, 2014
Credit Card Receivable [Member]
Subordinated Debt Securities [Member]
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Dec. 31, 2013
Credit Card Receivable [Member]
Subordinated Debt Securities [Member]
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Jun. 30, 2014
Credit Card Receivable [Member]
Consolidated VIEs [Member]
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Dec. 31, 2013
Credit Card Receivable [Member]
Consolidated VIEs [Member]
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Jun. 30, 2014
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Seller Interest [Member]
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Dec. 31, 2013
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Seller Interest [Member]
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Jun. 30, 2014
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Discount Receivables [Member]
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Dec. 31, 2013
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Discount Receivables [Member]
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| Variable Interest Entity [Line Items] | ||||||||||||||||||||||||||||||
| Maximum loss exposure | $ 46,699,000,000 | $ 49,621,000,000 | ||||||||||||||||||||||||||||
| On Balance Sheet Assets [Abstract] | ||||||||||||||||||||||||||||||
| Derivative assets | 47,892,000,000 | 47,495,000,000 | 25,000,000 | 185,000,000 | 21,000,000 | 182,000,000 | ||||||||||||||||||||||||
| Loans and leases | 911,899,000,000 | 928,233,000,000 | 102,799,000,000 | 109,118,000,000 | 57,297,000,000 | [1] | 61,241,000,000 | [1] | 39,400,000,000 | 41,200,000,000 | 5,000,000 | 14,000,000 | ||||||||||||||||||
| Allowance for loan and lease losses | (15,811,000,000) | (16,618,000,000) | (17,428,000,000) | (21,235,000,000) | (22,441,000,000) | (24,179,000,000) | (2,326,000,000) | (2,674,000,000) | (2,246,000,000) | (2,585,000,000) | ||||||||||||||||||||
| Loans Held-for-sale | 0 | 386,000,000 | ||||||||||||||||||||||||||||
| All other Assets | 121,651,000,000 | 124,090,000,000 | 3,946,000,000 | 4,577,000,000 | 1,560,000,000 | [2] | 2,281,000,000 | [2] | ||||||||||||||||||||||
| Total assets | 2,170,557,000,000 | [3] | 2,102,273,000,000 | [3] | 2,123,320,000,000 | [3] | 112,281,000,000 | 121,002,000,000 | 56,632,000,000 | 61,505,000,000 | ||||||||||||||||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||||||||||||||||||||||||
| Long-term debt | 257,071,000,000 | 249,674,000,000 | 16,333,000,000 | 19,448,000,000 | 9,896,000,000 | 11,822,000,000 | ||||||||||||||||||||||||
| All other liabilities | 93,000,000 | 253,000,000 | 37,000,000 | 62,000,000 | ||||||||||||||||||||||||||
| Total liabilities | 1,933,146,000,000 | 1,869,588,000,000 | 17,353,000,000 | 20,851,000,000 | 9,933,000,000 | 11,884,000,000 | ||||||||||||||||||||||||
| In Text Details [Abstract] | ||||||||||||||||||||||||||||||
| Fair Value of Securities Issuable | 1,300,000,000 | 3,000,000,000 | 0 | |||||||||||||||||||||||||||
| Notional Principal Amount Of Securities Issued By Securitization Trusts To Entity | 7,600,000,000 | 7,600,000,000 | 7,900,000,000 | |||||||||||||||||||||||||||
| Stated Interest Rate Of Securities Issued By Securitization Trusts To Entity | 0.00% | 0.00% | ||||||||||||||||||||||||||||
| Notional Principal Amount Of Securities Issued By Credit Card Securitization Trusts | 202,000,000 | 484,000,000 | 0 | |||||||||||||||||||||||||||
| Senior Interest of Receivable Held | $ 245,000,000 | $ 272,000,000 | ||||||||||||||||||||||||||||
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