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Debt - Automotive and GM Financial Debt (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Unsecured Debt | Line of Credit
Debt Instrument [Line Items]
Aggregate borrowing capacity	$ 11,200
Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility
Debt Instrument [Line Items]
Debt term		364 days
Aggregate borrowing capacity		$ 2,000	$ 2,000
Automotive
Debt Instrument [Line Items]
Finance lease liabilities		349	349	$ 237
Carrying Amount		16,818	16,818	17,469
Finance lease liabilities, Fair Value		362	362	256
Fair Value		20,569	20,569	21,576
Available under credit facility agreements		$ 15,208	$ 15,208	$ 18,222
Weighted-average interest rate on outstanding short-term debt		9.80%	9.80%	3.80%
Weighted-average interest rate on outstanding long-term debt		5.80%	5.80%	5.60%
Net discount and debt issuance costs		$ 512	$ 512	$ 540
Automotive | Secured Debt
Debt Instrument [Line Items]
Total debt		192	192	303
Fair Value		212	212	332
Automotive | Unsecured Debt
Debt Instrument [Line Items]
Total debt		16,277	16,277	16,929
Fair Value		19,995	19,995	20,988
Automotive | Level 1
Debt Instrument [Line Items]
Fair Value		19,085	19,085	19,826
Automotive | Level 2
Debt Instrument [Line Items]
Fair Value		1,484	1,484	1,750
GM Financial
Debt Instrument [Line Items]
Total debt		92,561	92,561	92,425
Fair Value		93,758	93,758	94,948
GM Financial | Secured Debt
Debt Instrument [Line Items]
Total debt		39,338	39,338	39,982
Fair Value		39,401	39,401	40,380
GM Financial | Unsecured Debt
Debt Instrument [Line Items]
Total debt		53,223	53,223	52,443
Fair Value		54,357	$ 54,357	54,568
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	$ 2,000
GM Financial | Level 2
Debt Instrument [Line Items]
Fair Value		92,250	92,250	92,922
GM Financial | Level 3
Debt Instrument [Line Items]
Fair Value		$ 1,508	$ 1,508	$ 2,026

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