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Overnight deposits expressed as a percentage of total deposits.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Weighted average interest rate for all deposit liabilities in foreign banking offices.

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Short-Term and Long-Term Debt Unsecured Debt and Extinguishment of Debt (Details) € in Millions, CAD in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Nov. 30, 2015 USD ($)	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	May. 31, 2015 CAD	Apr. 30, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Jan. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ 449	$ 202	$ (212)
Automotive [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount		538	325	1,800
Gain (loss) on extinguishment of debt		$ 449	$ 202	$ (212)
Automotive [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		0.00%	0.00%
Automotive [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		18.00%	18.00%
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes Issued November 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 2,500
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes 2025 at 4.0% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 500
Debt Instrument, Interest Rate, Stated Percentage												4.00%
Debt Instrument, Maturity Date			Dec. 31, 2025
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes 2035 at 5.0% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 750
Debt Instrument, Interest Rate, Stated Percentage												5.00%
Debt Instrument, Maturity Date			Dec. 31, 2035
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes 2045 at 5.2% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount												$ 1,250
Debt Instrument, Interest Rate, Stated Percentage												5.20%
Debt Instrument, Maturity Date			Dec. 31, 2045
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes Issued September 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 4,500
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes 2018 at 3.5% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 1,500
Debt Instrument, Interest Rate, Stated Percentage														3.50%
Debt Instrument, Maturity Date				Dec. 31, 2018
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes 2023 at 4.875% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 1,500
Debt Instrument, Interest Rate, Stated Percentage														4.875%
Debt Instrument, Maturity Date				Dec. 31, 2023
Unsecured Debt [Member] \| Automotive [Member] \| Senior Notes 2043 at 6.25% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount														$ 1,500
Debt Instrument, Interest Rate, Stated Percentage														6.25%
Debt Instrument, Maturity Date				Dec. 31, 2043
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, Start		Dec. 31, 2016
Debt Instrument, Maturity Date Range, End		Dec. 31, 2025
Weighted-average interest rate		3.37%
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes Issued January 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 2,250
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes January 2020 at 3.15% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 1,000
Debt Instrument, Interest Rate, Stated Percentage											3.15%
Debt Instrument, Maturity Date		Jan. 31, 2020
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes January 2025 at 4.0% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 1,000
Debt Instrument, Interest Rate, Stated Percentage											4.00%
Debt Instrument, Maturity Date		Jan. 31, 2025
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes January 2020 at Floating Rates [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 250
Debt Instrument, Maturity Date		Jan. 31, 2020
Unsecured Debt [Member] \| GM Financial [Member] \| Term Notes February 2018 at 0.85% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| €										€ 650
Debt Instrument, Interest Rate, Stated Percentage										0.85%
Debt Instrument, Maturity Date		Feb. 28, 2018
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes Issued April 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 2,400
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes April 2018 at 2.4% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 850
Debt Instrument, Interest Rate, Stated Percentage									2.40%
Debt Instrument, Maturity Date		Apr. 30, 2018
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes April 2022 at 3.45% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 1,250
Debt Instrument, Interest Rate, Stated Percentage									3.45%
Debt Instrument, Maturity Date		Apr. 30, 2022
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes April 2018 at Floating Rates [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 300
Debt Instrument, Maturity Date		Apr. 30, 2018
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes May 2020 at 3.08% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| CAD								CAD 500
Debt Instrument, Interest Rate, Stated Percentage								3.08%
Debt Instrument, Maturity Date		May 31, 2020
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes Issued July 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 2,300
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes July 2020 at 3.2% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 1,500
Debt Instrument, Interest Rate, Stated Percentage							3.20%
Debt Instrument, Maturity Date		Jul. 31, 2020
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes July 2025 at 4.3% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 800
Debt Instrument, Interest Rate, Stated Percentage							4.30%
Debt Instrument, Maturity Date		Jul. 31, 2025
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes Issued October 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 1,750
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes January 2019 at 3.1% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 1,500
Debt Instrument, Interest Rate, Stated Percentage						3.10%
Debt Instrument, Maturity Date		Jan. 31, 2019
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes January 2019 at Floating Rates [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 250
Debt Instrument, Maturity Date		Jan. 31, 2019
Unsecured Debt [Member] \| GM Financial [Member] \| Senior Notes November 2020 at 3.7% [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 1,000
Debt Instrument, Interest Rate, Stated Percentage					3.70%
Debt Instrument, Maturity Date		Nov. 30, 2020
Revolving Credit Facility [Member] \| Unsecured Debt [Member] \| Automotive [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity													$ 11,000
Number of Credit Facilities Entered Into	2
Revolving Credit Facility [Member] \| Unsecured Debt [Member] \| GM Financial [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		8.72%
Revolving Credit Facility [Member] \| Unsecured Debt [Member] \| GM Financial [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Term		5 years
Revolving Credit Facility October 2014 [Member] \| Unsecured Debt [Member] \| Automotive [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 12,500
Debt covenant, minimum liquidity requirement	$ 4,000
Revolving Credit Facility October 2014 [Member] \| Unsecured Debt [Member] \| Automotive [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Number of agencies needed to maintain investment grade rating	2
Three-year Revolving Credit Facility October 2014 [Member] \| Unsecured Debt [Member] \| Automotive [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000
Debt Instrument, Term	3 years
Sublimit available to GM FInancial	$ 2,000
Sublimit available for issuance of letters of credit	1,600
Sublimit available for borrowing denominated in Brazilian Real	305
Five-year Revolving Credit Facility October 2014 [Member] \| Unsecured Debt [Member] \| Automotive [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 7,500
Debt Instrument, Term	5 years
Sublimit available to GM FInancial	$ 2,000
Sublimit available for issuance of letters of credit	500
Sublimit available for borrowing denominated in Brazilian Real	195
U.S. \| Revolving Credit Facility October 2014 [Member] \| Unsecured Debt [Member] \| Automotive [Member]
Debt Instrument [Line Items]
Debt covenant, minimum liquidity requirement	$ 2,000
GERMANY \| Unsecured Debt [Member] \| GM Financial [Member]
Debt Instrument [Line Items]
Deposits		$ 1,300
Overnight Deposits, Percentage of Total Deposits		44.00%
Weighted-average interest rate		1.25%