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Loans - 90+ Day Delinquent Loans Accruing Interest and Nonperforming Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing $ 2,407 $ 2,233
Nonperforming Loans $ 983 $ 813
Percentage, 90 Days Past Due and Accruing 0.90% 0.90%
Percentage, Nonperforming Loans 0.40% 0.30%
Credit Card    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing $ 2,407 $ 2,233
Nonperforming Loans 25 22
Credit Card | Domestic credit card    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 2,277 2,111
Credit Card | International card business    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 130 122
Nonperforming Loans 25 22
Consumer Banking    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 510 479
Consumer Banking | Auto    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 487 449
Consumer Banking | Retail banking    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 23 30
Commercial Banking    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 448 312
Commercial Banking | Total commercial lending    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 448 306
Commercial Banking | Commercial and multifamily real estate    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 38 83
Commercial Banking | Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans 410 223
Commercial Banking | Small-ticket commercial real estate    
Financing Receivable, Past Due [Line Items]    
90 Days Past Due and Accruing 0 0
Nonperforming Loans $ 0 $ 6