GM Financial Receivables Retail Finance Receivables Delinquencies and TDRs (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Delinquent Contracts [Abstract]
Allowance for loan losses - TDRs	$ 310	$ 280
Retail Finance Receivables [Member]
Financing Receivable, Recorded Investment, Additional Information [Abstract]
Retail finance receivables, nonaccrual status	772	798
Delinquent Contracts [Abstract]
Past Due Amount	$ 1,583		$ 1,556
Percent of Contractual Amount Due	5.10%		6.40%
Finance receivables classified as TDRs	$ 2,000	1,900
Allowance for loan losses - TDRs	306	$ 276
31-to-60 days delinquent [Member] | Retail Finance Receivables [Member]
Delinquent Contracts [Abstract]
Past Due Amount	$ 1,076		$ 1,055
Percent of Contractual Amount Due	3.40%		4.30%
Greater-than-60 days delinquent [Member] | Retail Finance Receivables [Member]
Delinquent Contracts [Abstract]
Past Due Amount	$ 464		$ 454
Percent of Contractual Amount Due	1.50%		1.90%
Total finance receivables more than 30 days delinquent [Member] | Retail Finance Receivables [Member]
Delinquent Contracts [Abstract]
Past Due Amount	$ 1,540		$ 1,509
Percent of Contractual Amount Due	4.90%		6.20%
In repossession [Member] | Retail Finance Receivables [Member]
Delinquent Contracts [Abstract]
Past Due Amount	$ 43		$ 47
Percent of Contractual Amount Due	0.20%		0.20%
North America [Member] | Retail Finance Receivables [Member]
Financing Receivable, Recorded Investment, Additional Information [Abstract]
Percentage of receivables with sub-prime credit scores	41.00%	48.00%
Sub-prime FICO score	620	620