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Business Segments and Revenue from Contracts with Customers - Segment Results and Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net interest income $ 6,025 $ 5,791  
Non-interest income 1,224 1,292  
Total net revenue 7,249 7,083  
Provision for credit losses 5,423 1,693  
Total non-interest expense 3,729 3,671  
Income (loss) from continuing operations before income taxes (1,903) 1,719  
Income tax provision (benefit) (563) 309  
Income (loss) from continuing operations, net of tax (1,340) 1,410  
Loans held for investment 262,990 240,273 $ 265,809
Total Deposits 269,689 255,107 $ 262,697
Uncollectible Portion of Billed Finance Charges and Fees 389    
Operating segments | Credit Card      
Segment Reporting Information [Line Items]      
Net interest income 3,702 3,590  
Non-interest income 911 950  
Total net revenue 4,613 4,540  
Provision for credit losses 3,702 1,389  
Total non-interest expense 2,208 2,171  
Income (loss) from continuing operations before income taxes (1,297) 980  
Income tax provision (benefit) (306) 229  
Income (loss) from continuing operations, net of tax (991) 751  
Loans held for investment 117,797 109,836  
Total Deposits 0 0  
Operating segments | Consumer Banking      
Segment Reporting Information [Line Items]      
Net interest income 1,657 1,679  
Non-interest income 126 160  
Total net revenue 1,783 1,839  
Provision for credit losses 860 235  
Total non-interest expense 991 994  
Income (loss) from continuing operations before income taxes (68) 610  
Income tax provision (benefit) (16) 142  
Income (loss) from continuing operations, net of tax (52) 468  
Loans held for investment 64,033 59,248  
Total Deposits 217,607 205,439  
Operating segments | Commercial Banking      
Segment Reporting Information [Line Items]      
Net interest income 491 489  
Non-interest income 238 187  
Total net revenue 729 676  
Provision for credit losses 856 69  
Total non-interest expense 412 417  
Income (loss) from continuing operations before income taxes (539) 190  
Income tax provision (benefit) (128) 44  
Income (loss) from continuing operations, net of tax (411) 146  
Loans held for investment 81,160 71,189  
Total Deposits 32,822 31,248  
Other      
Segment Reporting Information [Line Items]      
Net interest income 175 33  
Non-interest income (51) (5)  
Total net revenue 124 28  
Provision for credit losses 5 0  
Total non-interest expense 118 89  
Income (loss) from continuing operations before income taxes 1 (61)  
Income tax provision (benefit) (113) (106)  
Income (loss) from continuing operations, net of tax 114 45  
Loans held for investment 0 0  
Total Deposits $ 19,260 $ 18,420