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Automotive and GM Financial Debt Other Disclosures (Details) € in Millions, $ in Millions	1 Months Ended	9 Months Ended	10 Months Ended
	May 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Jul. 31, 2016 USD ($)	May 31, 2016 EUR (€)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)
Automotive [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Number of Credit Facilities	2
Automotive [Member] | Unsecured Debt [Member] | Revolving Credit Facility October 2014 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 12,500
Automotive [Member] | Unsecured Debt [Member] | Revolving Credit Facility May 2016 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 14,500
Debt Covenant Minimum Liquidity Requirement	4,000
Automotive [Member] | Unsecured Debt [Member] | Revolving Credit Facility May 2016 [Member] | U.S.
Debt Instrument [Line Items]
Debt Covenant Minimum Liquidity Requirement	$ 2,000
Automotive [Member] | Unsecured Debt [Member] | Revolving Credit Facility May 2016 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number of agencies needed to maintain investment grade rating	2					2
Automotive [Member] | Unsecured Debt [Member] | Three-year Revolving Credit Facility May 2016 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,000
Debt Instrument, Term	3 years
Sublimit Available for Issuance of Letters of Credit	$ 1,000
Automotive [Member] | Unsecured Debt [Member] | Five-year Revolving Credit Facility May 2016 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,500
Debt Instrument, Term	5 years
Sublimit Available for Issuance of Letters of Credit	$ 500
Automotive [Member] | Unsecured Debt [Member] | Senior Notes Issued February 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 2,000
Automotive [Member] | Unsecured Debt [Member] | Senior Notes 2036 at 6.60% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 1,250
Debt Instrument, Interest Rate, Stated Percentage									6.60%
Debt Instrument, Maturity Date		Dec. 31, 2036
Automotive [Member] | Unsecured Debt [Member] | Senior Notes 2046 at 6.75% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 750
Debt Instrument, Interest Rate, Stated Percentage									6.75%
Debt Instrument, Maturity Date		Dec. 31, 2046
Automotive [Member] | Unsecured Debt [Member] | GM Financial Segment [Member] | Three-year Revolving Credit Facility May 2016 [Member]
Debt Instrument [Line Items]
Sublimit Available to GM Financial	1,000
Automotive [Member] | Unsecured Debt [Member] | GM Financial Segment [Member] | Five-year Revolving Credit Facility May 2016 [Member]
Debt Instrument [Line Items]
Sublimit Available to GM Financial	3,000
GM Financial [Member] | Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line Of Credit Increase Maximum Borrowing Capacity		$ 3,100
GM Financial [Member] | Secured Debt [Member] | Securitization notes payable [Member]
Debt Instrument [Line Items]
Securitization Notes Payable Issued		11,800
GM Financial [Member] | Unsecured Debt [Member] | GERMANY
Debt Instrument [Line Items]
Deposits		$ 1,900								$ 1,300
Overnight Deposits, Percentage of Total Deposits		41.00%		41.00%						44.00%
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes Issued March 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 2,750
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes March 2021 at 4.2% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 1,500
Debt Instrument, Interest Rate, Stated Percentage								4.20%
Debt Instrument, Maturity Date		Mar. 31, 2021
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes March 2026 at 5.25% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 1,250
Debt Instrument, Interest Rate, Stated Percentage								5.25%
Debt Instrument, Maturity Date		Mar. 31, 2026
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes Issued May 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	3,000
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes May 2019 at 2.40% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,400
Debt Instrument, Interest Rate, Stated Percentage	2.40%					2.40%
Debt Instrument, Maturity Date		May 31, 2019
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes May 2023 at 3.70% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,200
Debt Instrument, Interest Rate, Stated Percentage	3.70%					3.70%
Debt Instrument, Maturity Date		May 31, 2023
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes May 2019 at Floating Rates [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400
Debt Instrument, Maturity Date		May 31, 2019
GM Financial [Member] | Unsecured Debt [Member] | Term Notes May 2020 at 1.168% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €						€ 500
Debt Instrument, Interest Rate, Stated Percentage	1.168%					1.168%
Debt Instrument, Maturity Date		May 31, 2020
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes July 2021 at 3.2% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 2,000
Debt Instrument, Interest Rate, Stated Percentage					3.20%
Debt Instrument, Maturity Date		Jul. 31, 2021
GM Financial [Member] | Unsecured Debt [Member] | Term Notes September 2023 at 0.955% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €				€ 750
Debt Instrument, Interest Rate, Stated Percentage		0.955%		0.955%
Debt Instrument, Maturity Date		Sep. 30, 2023
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes Issued October 2016 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 1,750
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes October 2019 at 2.35% [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 750
Debt Instrument, Interest Rate, Stated Percentage			2.35%
Debt Instrument, Maturity Date			Oct. 31, 2019
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes October 2026 at 4.00% [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 750
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Debt Instrument, Maturity Date			Oct. 31, 2026
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes October 2019 at Floating Rates [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 250
Debt Instrument, Maturity Date			Oct. 31, 2019

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