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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
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         $ 261
GM Financial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for loan losses at beginning of period $ 1,835 $ 1,966 $ 1,978 $ 944 944
Provision for loan losses 59 327 33 793  
Charge-offs (204) (273) (457) (613)  
Recoveries 146 91 296 247  
Effect of foreign currency 14 0 0 (61)  
Allowance for loan losses at end of period 1,850 2,111 1,850 2,111 1,850
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 $ 801