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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 15 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2016-13 |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses decrease during period |  |  | $ 131
GM Financial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses at beginning of period | $ 1,978 | $ 944 | 944
Provision for loan losses | (26) | 466 |
Charge-offs | (253) | (340) |
Recoveries | 150 | 156 |
Effect of foreign currency | (14) | (61) |
Allowance for loan losses at end of period | 1,835 | 1,966 | 1,835
GM Financial | Impact of Adoption ASU 2016-13 | Accounting Standards Update 2016-13 |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses at beginning of period | $ 0 | $ 801 | $ 801

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