GM Financial Receivables, Net Allowance for Loan Losses (Details) - GM Financial [Member] - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Financing Receivable, Allowance for Credit Losses [Roll Forward] | ||
| Loan loss allowance at beginning of period | $ 782 | $ 695 |
| Provision for loan losses | 196 | 155 |
| Charge-offs | (293) | (234) |
| Recoveries | 150 | 124 |
| Effect of foreign currency | 8 | (12) |
| Loan loss allowance at end of period | $ 843 | $ 728 |