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GM Financial Receivables and Transactions - Commercial Finance Receivables Credit Quality Indicators (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
GM Financial    
Financing Receivable, Credit Quality Indicator [Line Items]    
GM Financial receivables, net of fees $ 61,801 $ 59,970
Commercial Finance Receivables | GM Financial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Revolving 4,418 7,662
2021 216 512
2020 466 185
2019 148 94
2018 73 100
2017 70 72
Prior 53 57
GM Financial receivables, net of fees $ 5,444 $ 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 $ 4,023 $ 6,968
2021 206 510
2020 448 159
2019 127 63
2018 45 95
2017 65 43
Prior 43 19
GM Financial receivables, net of fees $ 4,957 $ 7,857
Percent 91.10% 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 $ 292 $ 491
2021 2 2
2020 18 18
2019 18 2
2018 0 3
2017 3 18
Prior 5 34
GM Financial receivables, net of fees $ 338 $ 568
Percent 6.20% 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 $ 103 $ 203
2021 8 0
2020 0 8
2019 3 29
2018 28 2
2017 2 11
Prior 5 0
GM Financial receivables, net of fees $ 149 $ 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% 9700.00%