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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]        
Accounting Standards Update [Extensible List]     Accounting Standards Update 2016-13  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for loan losses decrease during period     $ 100  
GM Financial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for loan losses at beginning of period $ 1,850 $ 2,111 1,978 $ 944
Provision for loan losses 141 31 174 824
Charge-offs (207) (282) (664) (895)
Recoveries 133 136 429 383
Effect of foreign currency (14) 7 (14) (54)
Allowance for loan losses at end of period 1,903 2,003 1,903 2,003
GM Financial | Impact of Adoption ASU 2016-13 | Accounting Standards Update 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for loan losses at beginning of period $ 0 $ 0 $ 0 $ 801