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Business Segments and Revenue from Contracts with Customers - Segment Results and Reconciliation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Net interest income $ 23,340 $ 22,875 $ 22,460
Non-interest income 5,253 5,201 4,777
Total net revenue 28,593 28,076 27,237
Provision (benefit) for credit losses 6,236 5,856 7,551
Total non-interest expense 15,483 14,902 14,194
Income from continuing operations before income taxes 6,874 7,318 5,492
Income tax provision (benefit) 1,341 1,293 3,375
Income from continuing operations, net of tax 5,533 6,025 2,117
Loans held for investment 265,809 245,899 254,473
Total Deposits 262,697 249,764 243,702
Operating segments | Credit Card      
Segment Reporting Information [Line Items]      
Net interest income 14,461 14,167 13,648
Non-interest income 3,888 3,520 3,325
Total net revenue 18,349 17,687 16,973
Provision (benefit) for credit losses 4,992 4,984 6,066
Total non-interest expense 9,271 8,542 7,916
Income from continuing operations before income taxes 4,086 4,161 2,991
Income tax provision (benefit) 959 970 1,071
Income from continuing operations, net of tax 3,127 3,191 1,920
Loans held for investment 128,236 116,361 114,762
Total Deposits 0 0 0
Operating segments | Consumer Banking      
Segment Reporting Information [Line Items]      
Net interest income 6,732 6,549 6,380
Non-interest income 643 663 749
Total net revenue 7,375 7,212 7,129
Provision (benefit) for credit losses 938 838 1,180
Total non-interest expense 4,091 4,027 4,233
Income from continuing operations before income taxes 2,346 2,347 1,716
Income tax provision (benefit) 547 547 626
Income from continuing operations, net of tax 1,799 1,800 1,090
Loans held for investment 63,065 59,205 75,078
Total Deposits 213,099 198,607 185,842
Operating segments | Commercial Banking      
Segment Reporting Information [Line Items]      
Net interest income 1,983 2,044 2,261
Non-interest income 831 744 708
Total net revenue 2,814 2,788 2,969
Provision (benefit) for credit losses 306 83 301
Total non-interest expense 1,699 1,654 1,603
Income from continuing operations before income taxes 809 1,051 1,065
Income tax provision (benefit) 188 245 389
Income from continuing operations, net of tax 621 806 676
Loans held for investment 74,508 70,333 64,575
Total Deposits 32,134 29,480 33,938
Revenue change due to impact of federal tax rate   (108)  
Other      
Segment Reporting Information [Line Items]      
Net interest income 164 115 171
Non-interest income (109) 274 (5)
Total net revenue 55 389 166
Provision (benefit) for credit losses 0 (49) 4
Total non-interest expense 422 679 442
Income from continuing operations before income taxes (367) (241) (280)
Income tax provision (benefit) (353) (469) 1,289
Income from continuing operations, net of tax (14) 228 (1,569)
Loans held for investment 0 0 58
Total Deposits $ 17,464 $ 21,677 $ 23,922