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, 2018
Dec. 31, 2017
Intangible Assets [Abstract]    
Gross Carrying Value $ 13,640 $ 13,640
Accumulated Amortization 11,598 11,328
Net Carrying Value 2,042 2,312
Trade Names    
Intangible Assets [Abstract]    
Intangible assets, net (excluding goodwill) 1,600 1,600
Purchased credit card and affinity relationships    
Intangible Assets [Abstract]    
Gross Carrying Value 5,919 5,919
Accumulated Amortization 5,682 5,604
Net Carrying Value 237 315
Core deposit and other intangibles    
Intangible Assets [Abstract]    
Gross Carrying Value 3,835 3,835
Accumulated Amortization 2,181 2,140
Net Carrying Value 1,654 1,695
Customer relationships    
Intangible Assets [Abstract]    
Gross Carrying Value 3,886 3,886
Accumulated Amortization 3,735 3,584
Net Carrying Value $ 151 $ 302