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Loans - Credit Card Delinquency Status (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Total loans held for investment | $ 251,624 | $ 265,809 | $ 245,899
Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 106,323 |  |
Revolving Loans Converted to Term | 633 |  |
Total loans held for investment | 106,956 | 128,236 |
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 97,969 |  |
Revolving Loans Converted to Term | 535 |  |
Total loans held for investment | 98,504 | 118,606 |
International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 8,354 |  |
Revolving Loans Converted to Term | 98 |  |
Total loans held for investment | 8,452 | $ 9,630 |
Current | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 95,629 |  |
Revolving Loans Converted to Term | 487 |  |
Total loans held for investment | 96,116 |  |
Current | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 8,152 |  |
Revolving Loans Converted to Term | 66 |  |
Total loans held for investment | 8,218 |  |
30-59 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 734 |  |
Revolving Loans Converted to Term | 21 |  |
Total loans held for investment | 755 |  |
30-59 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 79 |  |
Revolving Loans Converted to Term | 11 |  |
Total loans held for investment | 90 |  |
60-89 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 451 |  |
Revolving Loans Converted to Term | 13 |  |
Total loans held for investment | 464 |  |
60-89 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 47 |  |
Revolving Loans Converted to Term | 11 |  |
Total loans held for investment | 58 |  |
Greater than 90 days | Domestic credit card: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 1,155 |  |
Revolving Loans Converted to Term | 14 |  |
Total loans held for investment | 1,169 |  |
Greater than 90 days | International card businesses: | Credit Card |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Revolving Loans | 76 |  |
Revolving Loans Converted to Term | 10 |  |
Total loans held for investment | $ 86 |  |

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