Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets [Abstract]    
Gross Carrying Value $ 13,640  
Accumulated Amortization 11,328  
Net Carrying Value 2,312  
Gross Carrying Value   $ 14,553
Accumulated Amortization   11,564
Net Carrying Value   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  
Accumulated Amortization 5,604  
Net Carrying Value 315  
Gross Carrying Value   6,830
Accumulated Amortization   6,243
Net Carrying Value   587
Core deposit intangibles    
Intangible Assets [Abstract]    
Gross Carrying Value 3,835  
Accumulated Amortization 2,140  
Net Carrying Value 1,695  
Gross Carrying Value   3,836
Accumulated Amortization   2,046
Net Carrying Value   1,790
Customer relationships    
Intangible Assets [Abstract]    
Gross Carrying Value 3,886  
Accumulated Amortization 3,584  
Net Carrying Value $ 302  
Gross Carrying Value   3,887
Accumulated Amortization   3,275
Net Carrying Value   $ 612