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Debt - Automotive and GM Financial Debt (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Automotive      
Debt Instrument [Line Items]      
Finance lease liabilities   $ 437 $ 381
Carrying Amount   16,413 17,844
Finance lease liabilities, Fair Value   447 381
Fair Value   16,490 16,828
Available under credit facility agreements   $ 16,446 $ 15,095
Weighted-average interest rate on outstanding short-term debt   16.20% 6.10%
Weighted-average interest rate on outstanding long-term debt   5.80% 5.80%
Net discount and debt issuance costs   $ 527 $ 525
Automotive | Secured Debt      
Debt Instrument [Line Items]      
Total debt   134 124
Fair Value   132 123
Automotive | Unsecured Debt      
Debt Instrument [Line Items]      
Total debt   15,842 17,340
Fair Value   15,911 16,323
Automotive | Level 1      
Debt Instrument [Line Items]      
Fair Value   15,457 15,971
Automotive | Level 2      
Debt Instrument [Line Items]      
Fair Value   1,033 857
GM Financial      
Debt Instrument [Line Items]      
Total debt   105,327 96,854
Fair Value   104,622 93,738
GM Financial | Secured Debt      
Debt Instrument [Line Items]      
Total debt   45,243 42,131
Fair Value   44,971 41,467
GM Financial | Unsecured Debt      
Debt Instrument [Line Items]      
Total debt   60,084 54,723
Fair Value   $ 59,651 52,270
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   102,262 91,545
GM Financial | Level 3      
Debt Instrument [Line Items]      
Fair Value   $ 2,360 $ 2,192