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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | $ 68,733 |  | $ 64,702 |  |  |
Less: allowance for loan losses | (2,027) | $ (1,928) | (1,886) | $ (1,850) | $ (1,835) | $ (1,978)
GM Financial receivables, net | 66,706 |  | 62,816 |  |  |
Retail Finance Receivables |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | 61,208 |  | 58,093 | $ 56,357 |  |
Less: allowance for loan losses | (1,987) |  | (1,839) |  |  |
GM Financial receivables, net | 59,220 |  | 56,254 |  |  |
Commercial Finance Receivables |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
GM Financial receivables, net of fees | 7,526 |  | 6,609 |  |  |
Less: allowance for loan losses | (40) |  | (47) |  |  |
GM Financial receivables, net | 7,486 |  | 6,562 |  |  |
Dealer cash management balance | 1,300 |  | 1,000 |  |  |
Level 2 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | 7,486 |  | 6,562 |  |  |
Level 3 |  |  |  |  |  |
Finance Receivables [Line Items] |  |  |  |  |  |
Fair value of GM Financial receivables | $ 58,528 |  | $ 57,613 |  |  |

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