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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]          
Accounting Standards Update [Extensible List]         us-gaap:AccountingStandardsUpdate201613Member
GM Financial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for loan losses at beginning of period $ 2,111 $ 957 $ 944 $ 911 $ 911
Provision for loan losses 31 150 824 504  
Charge-offs (282) (300) (895) (888)  
Recoveries 136 134 383 411  
Effect of foreign currency 7 (8) (54) (5)  
Allowance for loan losses at end of period $ 2,003 $ 933 2,003 $ 933 944
GM Financial [Member] | Impact of Adoption ASU 2016-13 [Member] | Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for loan losses at beginning of period     $ 801    
Allowance for loan losses at end of period         $ 801