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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Income (loss) from continuing operations before income taxes | $ 249,597 | $ 251,624 | $ 251,512
Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 100,513 | 106,323 |
Revolving Loans Converted to Term | 504 | 633 |
Income (loss) from continuing operations before income taxes | 101,017 | 106,956 |
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 94,871 | 97,969 |
Revolving Loans Converted to Term | 438 | 535 |
Income (loss) from continuing operations before income taxes | 95,309 | 98,504 |
International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 5,642 | 8,354 |
Revolving Loans Converted to Term | 66 | 98 |
Income (loss) from continuing operations before income taxes | 5,708 | 8,452 |
Current | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 93,304 | 95,629 |
Revolving Loans Converted to Term | 407 | 487 |
Income (loss) from continuing operations before income taxes | 93,711 | 96,116 |
Current | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 5,484 | 8,152 |
Revolving Loans Converted to Term | 52 | 66 |
Income (loss) from continuing operations before income taxes | 5,536 | 8,218 |
30-59 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 512 | 734 |
Revolving Loans Converted to Term | 13 | 21 |
Income (loss) from continuing operations before income taxes | 525 | 755 |
30-59 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 61 | 79 |
Revolving Loans Converted to Term | 6 | 11 |
Income (loss) from continuing operations before income taxes | 67 | 90 |
60-89 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 308 | 451 |
Revolving Loans Converted to Term | 9 | 13 |
Income (loss) from continuing operations before income taxes | 317 | 464 |
60-89 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 33 | 47 |
Revolving Loans Converted to Term | 4 | 11 |
Income (loss) from continuing operations before income taxes | 37 | 58 |
Greater than 90 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 747 | 1,155 |
Revolving Loans Converted to Term | 9 | 14 |
Income (loss) from continuing operations before income taxes | 756 | 1,169 |
Greater than 90 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 64 | 76 |
Revolving Loans Converted to Term | 4 | 10 |
Income (loss) from continuing operations before income taxes | $ 68 | $ 86 |

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