Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details)

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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Intangible Assets [Abstract]    
Gross Carrying Value $ 13,640 $ 14,553
Accumulated Amortization 11,030 11,564
Net Carrying Value 2,610 2,989
International Consumer Credit Card Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations    
Intangible Assets [Abstract]    
Disposal group, intangible assets   67
Trade Names    
Intangible Assets [Abstract]    
Intangible assets, net (excluding goodwill) 1,600 1,600
Purchased credit card relationships    
Intangible Assets [Abstract]    
Gross Carrying Value 5,919 6,830
Accumulated Amortization 5,502 6,243
Net Carrying Value 417 587
Core deposit intangibles    
Intangible Assets [Abstract]    
Gross Carrying Value 3,835 3,836
Accumulated Amortization 2,095 2,046
Net Carrying Value 1,740 1,790
Customer relationships    
Intangible Assets [Abstract]    
Gross Carrying Value 3,886 3,887
Accumulated Amortization 3,433 3,275
Net Carrying Value $ 453 $ 612