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Automotive and GM Financial Debt Automotive and GM Financial Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Amount of debt reclassified | $ 1,500,000,000 |
Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 13,502,000,000 | $ 10,560,000,000
Fair value of debt | 15,088,000,000 | 11,399,000,000
Available under credit facility agreements | $ 14,067,000,000 | $ 14,181,000,000
Weighted-average interest rate on outstanding short-term debt | 4.70% | 10.70%
Weighted-average interest rate on outstanding long-term debt | 5.20% | 5.20%
Net discount and debt issuance costs | $ 499,000,000 | $ 491,000,000
Automotive [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 204,000,000 | 108,000,000
Automotive [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 12,579,000,000 | 9,742,000,000
Automotive [Member] | Level 1 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 13,202,000,000 | 9,515,000,000
Automotive [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 1,886,000,000 | 1,884,000,000
GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 80,717,000,000 | 64,563,000,000
Fair value of debt | 81,937,000,000 | 65,207,000,000
GM Financial [Member] | Secured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 39,887,000,000 | 35,087,000,000
Fair value of debt | 39,948,000,000 | 35,162,000,000
GM Financial [Member] | Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 40,830,000,000 | 29,476,000,000
Fair value of debt | 41,989,000,000 | 30,045,000,000
GM Financial [Member] | Level 2 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 79,623,000,000 | 62,951,000,000
GM Financial [Member] | Level 3 [Member] |  |
Debt Instrument [Line Items] |  |
Fair value of debt | 2,314,000,000 | 2,256,000,000
Capital Lease Obligations [Member] | Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | 719,000,000 | $ 710,000,000
Capital Lease Obligations [Member] | GM Financial [Member] |  |
Debt Instrument [Line Items] |  |
Total debt | $ 0 |
Minimum [Member] | Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate range on outstanding debt | 0.00% | 0.00%
Maximum [Member] | Automotive [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate range on outstanding debt | 21.80% | 18.00%

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 + Details
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