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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 18 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 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 |  |  |  |  | $ 261
GM Financial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Allowance for loan losses at beginning of period | $ 1,835 | $ 1,966 | $ 1,978 | $ 944 | 944
Provision for loan losses | 59 | 327 | 33 | 793 |
Charge-offs | (204) | (273) | (457) | (613) |
Recoveries | 146 | 91 | 296 | 247 |
Effect of foreign currency | 14 | 0 | 0 | (61) |
Allowance for loan losses at end of period | 1,850 | 2,111 | 1,850 | 2,111 | 1,850
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 | $ 0 | $ 0 | $ 801 | $ 801

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