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Securitizations and Other Variable Interest Entities - Credit Card (Details) (USD $)
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3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||||||||||||
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Sep. 30, 2014
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Jun. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2014
Credit Card Receivable
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Dec. 31, 2013
Credit Card Receivable
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Sep. 30, 2014
Credit Card Receivable
Senior Lien
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Sep. 30, 2014
Credit Card Receivable
Senior Lien
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Dec. 31, 2013
Credit Card Receivable
Senior Lien
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Sep. 30, 2014
Credit Card Receivable
Junior Lien
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Sep. 30, 2014
Credit Card Receivable
Junior Lien
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Dec. 31, 2013
Credit Card Receivable
Junior Lien
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Sep. 30, 2014
Consolidated VIEs
Credit Card Receivable
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Dec. 31, 2013
Consolidated VIEs
Credit Card Receivable
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Sep. 30, 2014
Consolidated VIEs
Credit Card Receivable
Loans and leases
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Dec. 31, 2013
Consolidated VIEs
Credit Card Receivable
Loans and leases
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Sep. 30, 2014
Unconsolidated VIEs
Credit Card Receivable
Loans and leases
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Dec. 31, 2013
Unconsolidated VIEs
Credit Card Receivable
Loans and leases
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| Variable Interest Entity [Line Items] | ||||||||||||||||||||||||||||||
| Maximum loss exposure | $ 41,273,000,000 | $ 49,621,000,000 | ||||||||||||||||||||||||||||
| On-balance sheet assets | ||||||||||||||||||||||||||||||
| Derivative assets | 49,093,000,000 | 47,495,000,000 | 7,000,000 | 182,000,000 | ||||||||||||||||||||||||||
| Loans and leases | 891,315,000,000 | 928,233,000,000 | 52,674,000,000 | [1] | 61,241,000,000 | [1] | ||||||||||||||||||||||||
| Allowance for loan and lease losses | (15,106,000,000) | (15,811,000,000) | (17,428,000,000) | (19,432,000,000) | (21,235,000,000) | (24,179,000,000) | (1,926,000,000) | (2,585,000,000) | ||||||||||||||||||||||
| Loans held-for-sale | 7,909,000,000 | 11,362,000,000 | 0 | 386,000,000 | ||||||||||||||||||||||||||
| All other assets | 118,006,000,000 | 124,090,000,000 | 402,000,000 | [2] | 2,281,000,000 | [2] | ||||||||||||||||||||||||
| Total assets | 2,123,613,000,000 | [3] | 2,102,273,000,000 | 2,126,653,000,000 | [3] | 51,157,000,000 | 61,505,000,000 | |||||||||||||||||||||||
| On-balance sheet liabilities | ||||||||||||||||||||||||||||||
| Long-term debt | 250,115,000,000 | 249,674,000,000 | 9,858,000,000 | 11,822,000,000 | ||||||||||||||||||||||||||
| All other liabilities | 26,000,000 | 62,000,000 | ||||||||||||||||||||||||||||
| Total liabilities | 1,884,932,000,000 | 1,869,588,000,000 | 9,884,000,000 | 11,884,000,000 | ||||||||||||||||||||||||||
| Transferred financial assets, amount issued | 1,100,000,000 | 4,100,000,000 | 0 | 177,000,000 | 662,000,000 | 0 | ||||||||||||||||||||||||
| Principal amount outstanding | 7,600,000,000 | 7,900,000,000 | ||||||||||||||||||||||||||||
| Transferred financial assets, stated interest rate | 0.00% | |||||||||||||||||||||||||||||
| Residual interests held | $ 34,800,000,000 | $ 41,200,000,000 | $ 217,000,000 | $ 272,000,000 | ||||||||||||||||||||||||||
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