Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Other Asset Backed (Details)

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Securitizations and Other Variable Interest Entities - Other Asset Backed (Details) (USD $)
 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2013
Resecuritization Trusts [Member]
Sep. 30, 2012
Resecuritization Trusts [Member]
Sep. 30, 2013
Resecuritization Trusts [Member]
Sep. 30, 2012
Resecuritization Trusts [Member]
Sep. 30, 2013
Municipal Bonds [Member]
Dec. 31, 2012
Municipal Bonds [Member]
Sep. 30, 2013
Automobile And Other Securitization Trusts [Member]
Dec. 31, 2012
Automobile And Other Securitization Trusts [Member]
Sep. 30, 2013
Automobile Loan [Member]
Dec. 31, 2012
Automobile Loan [Member]
Sep. 30, 2013
Student Loan [Member]
Dec. 31, 2012
Student Loan [Member]
Sep. 30, 2013
Other Loan and Receivable [Member]
Dec. 31, 2012
Other Loan and Receivable [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Resecuritization Trusts [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Resecuritization Trusts [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Resecuritization Trusts [Member]
Senior Debt Securities [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Resecuritization Trusts [Member]
Senior Debt Securities [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Resecuritization Trusts [Member]
Subordinated Debt Securities [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Resecuritization Trusts [Member]
Subordinated Debt Securities [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Municipal Bonds [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Municipal Bonds [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Municipal Bonds [Member]
Senior Debt Securities [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Municipal Bonds [Member]
Senior Debt Securities [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Municipal Bonds [Member]
Subordinated Debt Securities [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Municipal Bonds [Member]
Subordinated Debt Securities [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Senior Debt Securities [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Senior Debt Securities [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Subordinated Debt Securities [Member]
Dec. 31, 2012
Unconsolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Subordinated Debt Securities [Member]
Sep. 30, 2013
Consolidated VIEs [Member]
Dec. 31, 2012
Consolidated VIEs [Member]
Sep. 30, 2013
Consolidated VIEs [Member]
Resecuritization Trusts [Member]
Dec. 31, 2012
Consolidated VIEs [Member]
Resecuritization Trusts [Member]
Sep. 30, 2013
Consolidated VIEs [Member]
Municipal Bonds [Member]
Dec. 31, 2012
Consolidated VIEs [Member]
Municipal Bonds [Member]
Sep. 30, 2013
Consolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Dec. 31, 2012
Consolidated VIEs [Member]
Automobile And Other Securitization Trusts [Member]
Variable Interest Entity [Line Items]                                                                                            
Maximum loss exposure                                         $ 13,075,000,000 $ 20,715,000,000         $ 2,322,000,000 $ 3,341,000,000         $ 99,000,000 $ 122,000,000             $ 250,000,000 $ 126,000,000 $ 2,987,000,000 $ 2,505,000,000 $ 196,000,000 $ 1,255,000,000
On Balance Sheet Assets [Abstract]                                                                                            
Trading account assets                                             779,000,000 [1],[2] 1,281,000,000 [1],[2]         134,000,000 [1],[2] 12,000,000 [1],[2]         17,000,000 [1],[2] 37,000,000 [1],[2]         1,169,000,000 220,000,000 2,987,000,000 2,505,000,000 0 0
Loans and leases 934,392,000,000   907,819,000,000                                                                       109,996,000,000 123,227,000,000 0 0 0 0 867,000,000 2,523,000,000
Allowance for loan and lease losses (19,432,000,000) (21,235,000,000) (24,179,000,000) (26,233,000,000) (30,288,000,000) (33,783,000,000)                                                                 (2,962,000,000) (3,658,000,000) 0 0 0 0 (1,000,000) (2,000,000)
AFS Debt Securities                                             12,174,000,000 [1],[2] 19,343,000,000 [1],[2] 67,000,000 [1],[2] 75,000,000 [1],[2]     0 [1],[2] 540,000,000 [1],[2] 0 [1],[2] 0 [1],[2]     72,000,000 [1],[2] 74,000,000 [1],[2] 0 [1],[2] 0 [1],[2]                
Residual interests held                                         55,000,000 [3] 16,000,000 [3]         0 [3] 0 [3]         0 [3] 0 [3]                        
Other Assets 122,068,000,000   150,112,000,000                                   0 0         0 0         10,000,000 11,000,000         4,314,000,000 4,654,000,000 0 0 0 0 80,000,000 250,000,000
Total assets 2,126,653,000,000   2,209,974,000,000 2,166,162,000,000                                 13,075,000,000 20,715,000,000         134,000,000 552,000,000         99,000,000 122,000,000         122,165,000,000 134,431,000,000 1,169,000,000 220,000,000 2,987,000,000 2,505,000,000 946,000,000 2,771,000,000
Unconsolidated, Total assets of VIEs                                         39,742,000,000 [4] 42,818,000,000 [4]         3,859,000,000 [4] 4,980,000,000 [4]         1,949,000,000 [4] 1,890,000,000 [4]                        
On Balance Sheet Liabilities [Abstract]                                                                                            
Commercial paper and other short-term borrowings 40,769,000,000   30,731,000,000                                                                       2,180,000,000 3,731,000,000 0 0 1,336,000,000 2,859,000,000 0 0
Long-term debt 255,331,000,000   275,585,000,000                                                                       24,481,000,000 34,256,000,000 919,000,000 94,000,000 0 0 749,000,000 1,513,000,000
Other Liabilities                                                                             382,000,000 360,000,000 0 0 0 0 82,000,000 82,000,000
Total liabilities 1,894,371,000,000   1,973,018,000,000                                                                       27,043,000,000 38,347,000,000 919,000,000 94,000,000 1,336,000,000 2,859,000,000 831,000,000 1,595,000,000
In Text Details [Abstract]                                                                                            
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds, in Period             6,600,000,000 12,200,000,000 18,200,000,000 36,500,000,000                                                                        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale             0 0 0 0                                                                        
Liquidity Commitments To Unconsolidated Securitization Trusts                     2,200,000,000 2,800,000,000                                                                    
Weighted average remaining life of bonds held in the trusts in years 8 years 6 months                                                                                          
Qualitative and Quantitative Information, Transferor's Continuing Involvement, Principal Amount Outstanding, Continued Recognition, Amount                         $ 2,900,000,000 $ 4,700,000,000 $ 1,200,000,000 $ 3,500,000,000 $ 773,000,000 $ 897,000,000 $ 920,000,000 $ 290,000,000                                                    
[1] As a holder of these securities, the Corporation receives scheduled principal and interest payments. During the three and nine months ended September 30, 2013 and 2012, there were no OTTI losses recorded on those securities classified as AFS debt securities.
[2] The retained senior and subordinate securities were valued using quoted market prices or observable market inputs (Level 2 of the fair value hierarchy).
[3] The retained residual interests are carried at fair value which was derived using model valuations (Level 2 of the fair value hierarchy).
[4] Total assets include loans the Corporation transferred with which the Corporation has continuing involvement, which may include servicing the loan.