GM Financial Receivables Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	$ 40,326	$ 33,933
Commercial Finance Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	9,343	7,533
Commercial Finance Receivables [Member] | Group I - Dealers with superior financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	1,610	1,372
Commercial Finance Receivables [Member] | Group II - Dealers with strong financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	3,260	2,526
Commercial Finance Receivables [Member] | Group III - Dealers with fair financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	3,180	2,598
Commercial Finance Receivables [Member] | Group IV - Dealers with weak financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	855	613
Commercial Finance Receivables [Member] | Group V - Dealers warranting special mention due to potential weaknesses [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	328	334
Commercial Finance Receivables [Member] | Group VI - Dealers with loans classified as substandard, doubtful or impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	$ 110	$ 90