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Automotive and GM Financial Debt Other Disclosures (Details) - GM Financial [Member] - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Secured Debt [Member] | Securitization notes payable [Member]
Debt Instrument [Line Items]
Securitization notes payable issued		$ 4,000,000,000
Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facilities entered, total net additional borrowing capacity		182,000,000
Unsecured Debt [Member] | GERMANY [Member]
Debt Instrument [Line Items]
Outstanding balance of deposits		$ 1,900,000,000	$ 1,900,000,000
Overnight deposits, percentage of total deposits		41.00%	42.00%
Unsecured Debt [Member] | Senior Notes January 2022 at 3.45% [Member]
Debt Instrument [Line Items]
Principal amount		$ 1,250,000,000
Stated interest rate		3.45%
Debt maturity date		Jan. 31, 2022
Unsecured Debt [Member] | Senior Notes January 2027 at 4.35% [Member]
Debt Instrument [Line Items]
Principal amount		$ 750,000,000
Stated interest rate		4.35%
Debt maturity date		Jan. 31, 2027
Unsecured Debt [Member] | Senior Notes January 2022 at Floating Rates [Member]
Debt Instrument [Line Items]
Principal amount		$ 500,000,000
Debt maturity date		Jan. 31, 2022
Unsecured Debt [Member] | Senior Notes Issued April 2017 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount	$ 3,000,000,000
Unsecured Debt [Member] | Senior Notes April 2020 at 2.65% [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,000,000,000
Stated interest rate	2.65%
Debt maturity date	Apr. 30, 2020
Unsecured Debt [Member] | Senior Notes April 2024 at 3.95% [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,250,000,000
Stated interest rate	3.95%
Debt maturity date	Apr. 30, 2024
Unsecured Debt [Member] | Senior Notes April 2020 at Floating Rates [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount	$ 750,000,000
Debt maturity date	Apr. 30, 2020
Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 2,500,000,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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