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Loans - TDR - Subsequent Defaults (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Contract | Jun. 30, 2019 USD ($) Contract | Jun. 30, 2020 USD ($) Contract | Jun. 30, 2019 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 27,954 | 31,082 | 57,979 | 62,928
Total Loans | $ | $ 78 | $ 71 | $ 170 | $ 141
Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 27,090 | 29,766 | 55,833 | 60,499
Total Loans | $ | $ 46 | $ 54 | $ 94 | $ 111
Consumer Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 863 | 1,316 | 2,139 | 2,429
Total Loans | $ | $ 11 | $ 17 | $ 27 | $ 30
Consumer Banking | Auto |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 860 | 1,312 | 2,135 | 2,417
Total Loans | $ | $ 11 | $ 16 | $ 27 | $ 29
Consumer Banking | Retail banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 3 | 4 | 4 | 12
Total Loans | $ | $ 0 | $ 1 | $ 0 | $ 1
Commercial Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 0 | 7 | 0
Total Loans | $ | $ 21 | $ 0 | $ 49 | $ 0
Commercial Banking | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 0 | 7 | 0
Total Loans | $ | $ 21 | $ 0 | $ 49 | $ 0
Domestic credit card: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 9,582 | 11,581 | 20,468 | 25,608
Total Loans | $ | $ 21 | $ 26 | $ 43 | $ 55
International card businesses: | Credit Card |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Contracts | Contract | 17,508 | 18,185 | 35,365 | 34,891
Total Loans | $ | $ 25 | $ 28 | $ 51 | $ 56

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