Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Credit Card (Details)

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Securitizations and Other Variable Interest Entities - Credit Card (Details) (USD $)
 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Consolidated VIEs [Member]
Dec. 31, 2012
Consolidated VIEs [Member]
Jun. 30, 2013
Credit Card Receivable [Member]
Dec. 31, 2012
Credit Card Receivable [Member]
Dec. 31, 2012
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Jun. 30, 2013
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Jun. 30, 2013
Seller Interest [Member]
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Dec. 31, 2012
Seller Interest [Member]
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Jun. 30, 2013
Discount Receivables [Member]
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Dec. 31, 2012
Discount Receivables [Member]
Credit Card Receivable [Member]
Consolidated VIEs [Member]
Jun. 30, 2013
Subordinated Debt Securities [Member]
Credit Card Receivable [Member]
Dec. 31, 2012
Subordinated Debt Securities [Member]
Credit Card Receivable [Member]
Variable Interest Entity [Line Items]                                    
Maximum loss exposure                     $ 42,487,000,000 $ 42,551,000,000            
On Balance Sheet Assets [Abstract]                                    
Derivative assets 56,772,000,000   53,497,000,000       173,000,000 333,000,000     323,000,000 173,000,000            
Loans and leases 921,570,000,000   907,819,000,000       113,045,000,000 123,227,000,000     66,427,000,000 [1] 61,562,000,000 [1] 34,500,000,000 33,500,000,000 42,000,000 124,000,000    
Allowance for loan and lease losses (21,235,000,000) (22,441,000,000) (24,179,000,000) (30,288,000,000) (32,211,000,000) (33,783,000,000) (3,157,000,000) (3,658,000,000)     (3,445,000,000) (3,039,000,000)            
Other Assets 127,880,000,000   150,112,000,000       3,927,000,000 4,654,000,000     1,567,000,000 [2] 1,177,000,000 [2]            
Total assets 2,123,320,000,000   2,209,974,000,000 2,160,854,000,000     122,371,000,000 134,431,000,000     64,872,000,000 59,873,000,000            
Derivative Liabilities 48,532,000,000   46,016,000,000                              
On Balance Sheet Liabilities [Abstract]                                    
Commercial paper and other short-term borrowings 46,470,000,000   30,731,000,000       1,421,000,000 3,731,000,000                    
Long-term debt 262,480,000,000   275,585,000,000       25,946,000,000 34,256,000,000     22,291,000,000 17,214,000,000            
Other Liabilities             390,000,000 360,000,000     94,000,000 108,000,000            
Total liabilities 1,892,288,000,000   1,973,018,000,000       27,757,000,000 38,347,000,000     22,385,000,000 17,322,000,000            
In Text Details [Abstract]                                    
Notional Principal Amount Of Securities Issued By Securitization Trusts To Entity                                 9,300,000,000 10,100,000,000
Stated Interest Rate Of Securities Issued By Securitization Trusts To Entity                                 0.00%  
Cash Flows Between Transferor and Transferee, Beneficial Interest                     553,000,000              
Senior Interest of Receivable Held                 $ 286,000,000 $ 309,000,000                
[1] At June 30, 2013 and December 31, 2012, loans and leases included $34.5 billion and $33.5 billion of seller's interest and $42 million and $124 million of discount receivables.
[2] At June 30, 2013 and December 31, 2012, all other assets included restricted cash and short-term investment accounts and unbilled accrued interest and fees.