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Debt - Schedule of Debt Carrying Amount and Fair Value (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Automotive      
Debt Instrument [Line Items]      
Finance lease liabilities $ 433 $ 433 $ 437
Finance lease liabilities, Fair Value 442 442 447
Carrying Amount 16,327 16,327 16,413
Fair Value 16,315 16,315 16,490
Available under credit facility agreements $ 13,536 $ 13,536 $ 16,446
Weighted-average interest rate on outstanding short-term debt 16.90% 16.90% 16.20%
Weighted-average interest rate on outstanding long-term debt 5.80% 5.80% 5.80%
Net discount and debt issuance costs $ 505 $ 505 $ 527
Automotive | Secured Debt      
Debt Instrument [Line Items]      
Carrying Amount 116 116 134
Fair Value 116 116 132
Automotive | Unsecured Debt      
Debt Instrument [Line Items]      
Carrying Amount 15,778 15,778 15,842
Fair Value 15,757 15,757 15,911
Automotive | Level 1      
Debt Instrument [Line Items]      
Fair Value 15,357 15,357 15,457
Automotive | Level 2      
Debt Instrument [Line Items]      
Fair Value 957 957 1,033
GM Financial      
Debt Instrument [Line Items]      
Carrying Amount 105,910 105,910 105,327
Fair Value 105,322 105,322 104,622
GM Financial | Secured Debt      
Debt Instrument [Line Items]      
Carrying Amount 44,212 44,212 45,243
Fair Value 43,892 43,892 44,971
GM Financial | Unsecured Debt      
Debt Instrument [Line Items]      
Carrying Amount 61,698 61,698 60,084
Fair Value $ 61,430 $ 61,430 59,651
GM Financial | Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt term 364 days 364 days  
Aggregate borrowing capacity $ 2,000 $ 2,000  
GM Financial | Level 2      
Debt Instrument [Line Items]      
Fair Value 103,049 103,049 102,262
GM Financial | Level 3      
Debt Instrument [Line Items]      
Fair Value $ 2,274 $ 2,274 $ 2,360