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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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