Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Principles - Principles of Consolidation and Basis of Presentation (Details)

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Summary of Significant Accounting Principles - Principles of Consolidation and Basis of Presentation (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loans and leases $ 9,505 $ 9,214
Goodwill 775 775
Available-for-sale securities of business held for sale 691 619
Disposal Group, Held-for-sale, Not Discontinued Operations | International Consumer Credit Card Business    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loans and leases 9,500 9,200
Allowance for loan and lease losses 242 243
Goodwill 775 775
Available-for-sale securities of business held for sale 691 619
All other assets $ 296 $ 305