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Automotive and GM Financial Debt - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2019 | Jan. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Jul. 31, 2020 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Finance lease assets |  |  | $ 389 | $ 389 |  |
Finance lease right of use asset obtained in exchange for lease obligations |  |  |  | 122 |  |
Finance lease payments for the remainder of the year |  |  | 135 | 135 |  |
Years 2020 to 2023 |  |  | 185 | 185 |  |
Thereafter |  |  | 376 | 376 |  |
Imputed interest |  |  | $ 340 | $ 340 |  |
Finance lease weighted-average discount rate |  |  | 10.80% | 10.80% |  |
Finance leas weighted average remaining lease term |  |  | 12 years 4 months 24 days | 12 years 4 months 24 days |  |
Unsecured Debt [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Borrowings from revolving credit facility |  |  | $ 300 | $ 700 |  |
Unsecured Debt [Member] | Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term |  | 3 years |  |  |  |
Aggregate borrowing capacity |  | $ 3,000 |  |  |  |
GM Financial [Member] | Secured Debt [Member] | Notes Payable, Other Payables [Member] | Securitization notes payable [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  | $ 10,400 | $ 10,400 |  |
Weighted average interest rate (percent) |  |  | 2.98% | 2.98% |  |
GM Financial [Member] | Unsecured Debt [Member] | Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt term | 364 days |  |  |  |  |
Aggregate borrowing capacity | $ 2,000 |  |  |  |  |
Debt renewal term | 364 days |  |  |  |  |
GM Financial [Member] | Unsecured Debt [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  |  | $ 5,400 | $ 5,400 |  |
Weighted average interest rate (percent) |  |  | 4.20% | 4.20% |  |
U.S. [Member] | GM Financial [Member] | Unsecured Debt [Member] | Commercial Paper [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts borrowed under revolving credit facility |  |  | $ 1,000 | $ 1,000 |  | $ 1,200
Forecast [Member] | Unsecured Debt [Member] | Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate borrowing capacity |  |  |  |  | $ 2,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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