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Business Segments and Revenue from Contracts with Customers - Segment Results and Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | $ 22,913 | $ 23,340 | $ 22,875
Non-interest income (loss) | 5,610 | 5,253 | 5,201
Total net revenue (loss) | 28,523 | 28,593 | 28,076
Provision for credit losses | 10,264 | 6,236 | 5,856
Non-interest expense | 15,056 | 15,483 | 14,902
Income (loss) from continuing operations before income taxes | 3,203 | 6,874 | 7,318
Income tax provision | 486 | 1,341 | 1,293
Income (loss) from continuing operations, net of tax | 2,717 | 5,533 | 6,025
Total loans held for investment | 251,624 | 265,809 | 245,899
Total Deposits | 305,442 | 262,697 | 249,764
Uncollectible Portion of Billed Finance Charges and Fees | 1,100 | 1,400 | 1,300
Operating segments | Credit Card |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 13,776 | 14,461 | 14,167
Non-interest income (loss) | 3,823 | 3,888 | 3,520
Total net revenue (loss) | 17,599 | 18,349 | 17,687
Provision for credit losses | 7,327 | 4,992 | 4,984
Non-interest expense | 8,491 | 9,271 | 8,542
Income (loss) from continuing operations before income taxes | 1,781 | 4,086 | 4,161
Income tax provision | 420 | 959 | 970
Income (loss) from continuing operations, net of tax | 1,361 | 3,127 | 3,191
Total loans held for investment | 106,956 | 128,236 | 116,361
Total Deposits | 0 | 0 | 0
Operating segments | Consumer Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 7,238 | 6,732 | 6,549
Non-interest income (loss) | 466 | 643 | 663
Total net revenue (loss) | 7,704 | 7,375 | 7,212
Provision for credit losses | 1,753 | 938 | 838
Non-interest expense | 4,159 | 4,091 | 4,027
Income (loss) from continuing operations before income taxes | 1,792 | 2,346 | 2,347
Income tax provision | 425 | 547 | 547
Income (loss) from continuing operations, net of tax | 1,367 | 1,799 | 1,800
Total loans held for investment | 68,888 | 63,065 | 59,205
Total Deposits | 249,815 | 213,099 | 198,607
Operating segments | Commercial Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | 2,048 | 1,983 | 2,044
Non-interest income (loss) | 923 | 831 | 744
Total net revenue (loss) | 2,971 | 2,814 | 2,788
Provision for credit losses | 1,181 | 306 | 83
Non-interest expense | 1,706 | 1,699 | 1,654
Income (loss) from continuing operations before income taxes | 84 | 809 | 1,051
Income tax provision | 19 | 188 | 245
Income (loss) from continuing operations, net of tax | 65 | 621 | 806
Total loans held for investment | 75,780 | 74,508 | 70,333
Total Deposits | 39,590 | 32,134 | 29,480
Revenue change due to impact of federal tax rate |  |  | (108)
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income (loss) | (149) | 164 | 115
Non-interest income (loss) | 398 | (109) | 274
Total net revenue (loss) | 249 | 55 | 389
Provision for credit losses | 3 | 0 | (49)
Non-interest expense | 700 | 422 | 679
Income (loss) from continuing operations before income taxes | (454) | (367) | (241)
Income tax provision | (378) | (353) | (469)
Income (loss) from continuing operations, net of tax | (76) | (14) | 228
Total loans held for investment | 0 | 0 | 0
Total Deposits | $ 16,037 | $ 17,464 | $ 21,677

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