GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2021 |
Mar. 31, 2020 |
Dec. 31, 2020 |
|
| Related Party Transaction [Line Items] | |||
| Commercial finance receivables, net due from GM consolidated dealers | $ 58,272 | $ 57,992 | |
| Common stock dividends declared and paid | 600 | $ 400 | |
| Commercial Finance Receivables | |||
| Related Party Transaction [Line Items] | |||
| Commercial finance receivables, net due from GM consolidated dealers | 6,659 | 8,619 | |
| Intersegment Eliminations | |||
| Related Party Transaction [Line Items] | |||
| Subvention receivable | 668 | 642 | |
| Interest subvention earned on finance receivables | 188 | 156 | |
| Leased vehicle subvention earned | 721 | 805 | |
| Cash payments | 1,000 | $ 1,100 | |
| Intersegment Eliminations | Commercial Finance Receivables | |||
| Related Party Transaction [Line Items] | |||
| Commercial finance receivables, net due from GM consolidated dealers | 313 | 398 | |
| Commercial loan funding payable | $ 61 | $ 23 | |