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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Commercial finance receivables, net due from GM consolidated dealers | $ 59,951 |  | $ 59,951 |  | $ 57,992
Common stock dividends declared and paid | 600 | $ 400 | 1,200 | $ 800 |
Commercial Finance Receivables |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Commercial finance receivables, net due from GM consolidated dealers | 5,399 |  | 5,399 |  | 8,619
Intersegment Eliminations |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Subvention receivable | 590 |  | 590 |  | 642
Interest subvention earned on finance receivables | 211 | 162 | 399 | 318 |
Leased vehicle subvention earned | 704 | 765 | 1,425 | 1,570 |
Cash payments | 1,000 | $ 967 | 2,000 | $ 2,000 |
Intersegment Eliminations | Commercial Finance Receivables |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Commercial finance receivables, net due from GM consolidated dealers | 261 |  | 261 |  | 398
Commercial loan funding payable | $ 30 |  | $ 30 |  | $ 23

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