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GM Financial Receivables and Transactions - Commercial Finance Receivables Credit Quality Indicators (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
GM Financial    
Financing Receivable, Credit Quality Indicator [Line Items]    
GM Financial receivables, net of fees $ 61,641 $ 59,970
Commercial Finance Receivables | GM Financial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving 3,181 7,662
2021 295 512
2020 448 185
2019 144 94
2018 60 100
2017 67 72
Prior 22 57
GM Financial receivables, net of fees $ 4,217 $ 8,682
Percent 100.00% 100.00%
Commercial Finance Receivables | GM Financial | Group I - Performing accounts with strong to acceptable financial metrics    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving $ 2,958 $ 6,968
2021 285 510
2020 417 159
2019 125 63
2018 34 95
2017 62 43
Prior 13 19
GM Financial receivables, net of fees $ 3,894 $ 7,857
Percent 92.30% 90.50%
Commercial Finance Receivables | GM Financial | Group II - Performing accounts experiencing potential weakness in financial metrics    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving $ 168 $ 491
2021 2 2
2020 16 18
2019 17 2
2018 0 3
2017 3 18
Prior 5 34
GM Financial receivables, net of fees $ 211 $ 568
Percent 5.00% 6.50%
Commercial Finance Receivables | GM Financial | Group III - Non-Performing accounts with inadequate paying capacity for current obligations    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving $ 55 $ 203
2021 8 0
2020 15 8
2019 2 29
2018 26 2
2017 2 11
Prior 4 0
GM Financial receivables, net of fees $ 112 $ 253
Percent 2.70% 2.90%
Commercial Finance Receivables | GM Financial | Group IV - Non-Performing accounts with inadequate paying capacity for current obligations and inherent weaknesses    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving $ 0 $ 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
2017 0 0
Prior 0 4
GM Financial receivables, net of fees $ 0 $ 4
Percent 0.00% 0.10%
Floorplan Advances | Commercial Finance Receivables    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percent of revolving balance 94.00% 97.00%