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Debt - Narrative (Details) - USD ($) $ in Billions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020
Unsecured Debt [Member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Debt term |  | 3 years
Aggregate borrowing capacity |  | $ 3.0
Proceeds borrowed |  | 2.0
Dividend restriction covenant, amount outstanding |  | 5.0
Unsecured Debt [Member] | Line of Credit [Member] | Five Year Revolving Credit Facility Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity |  | 10.5
Proceeds borrowed |  | $ 10.5
Unsecured Debt [Member] | Line of Credit [Member] | Three Year Revolving Credit Facility April 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt term |  | 3 years
Aggregate borrowing capacity |  | $ 4.0
Proceeds borrowed |  | $ 3.4
Unsecured Debt [Member] | Line of Credit [Member] | Five Year Revolving Credit Facility April 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Debt term |  | 5 years
GM Financial [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate (percent) |  | 4.47%
GM Financial [Member] | Unsecured Debt [Member] | Line of Credit [Member] | $2.0 Billion Dollar Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt term |  | 364 days
Aggregate borrowing capacity |  | $ 2.0
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate on outstanding long-term debt |  | 3.33%
Principal amount |  | $ 2.1
Weighted average interest rate (percent) |  | 2.09%
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member] |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate on outstanding long-term debt |  | 2.59%
Principal amount |  | $ 4.6
Weighted average interest rate (percent) |  | 1.95%
Subsequent Event [Member] | Unsecured Debt [Member] | Line of Credit [Member] | Three Year Revolving Credit Facility April 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate borrowing capacity | $ 3.6 |
Subsequent Event [Member] | GM Financial [Member] | Unsecured Debt [Member] | Line of Credit [Member] | $2.0 Billion Dollar Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt term | 364 days |
Maximum [Member] | GM Financial [Member] | Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt term |  | 4 years

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- Definition Line of Credit Facility, Covenant Terms, Dividend Restrictions, Amount Outstanding + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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