GM Financial Receivables, Net Summary of Finance Receivables, Net (Details) - GM Financial [Member] - USD ($) $ in Millions |
Sep. 30, 2015 |
Jun. 30, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Dec. 31, 2013 |
|---|---|---|---|---|---|---|
| Finance Receivables [Line Items] | ||||||
| Finance Receivables | $ 35,646 | $ 33,229 | ||||
| Less: Allowance for Loan Losses | (758) | $ (760) | (695) | $ (645) | $ (615) | $ (548) |
| GM Financial Receivables, Net | 34,888 | 32,534 | ||||
| Fair value of GM Financial receivables, net | 35,039 | 33,106 | ||||
| Allowance for loans losses classified as current | (573) | (529) | ||||
| Consumer Finance Receivables [Member] | ||||||
| Finance Receivables [Line Items] | ||||||
| Finance Receivables | 27,987 | 25,623 | ||||
| Less: Allowance for Loan Losses | (718) | (655) | ||||
| GM Financial Receivables, Net | 27,269 | 24,968 | ||||
| Commercial Finance Receivables [Member] | ||||||
| Finance Receivables [Line Items] | ||||||
| Finance Receivables | 7,659 | 7,606 | ||||
| Less: Allowance for Loan Losses | (40) | (40) | ||||
| GM Financial Receivables, Net | $ 7,619 | $ 7,566 |