XML 62 R48.htm IDEA: XBRL DOCUMENT v3.21.1
GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 15 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 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     $ 131
GM Financial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loan losses at beginning of period $ 1,978 $ 944 944
Provision for loan losses (26) 466  
Charge-offs (253) (340)  
Recoveries 150 156  
Effect of foreign currency (14) (61)  
Allowance for loan losses at end of period 1,835 1,966 1,835
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 $ 801 $ 801