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Automotive and GM Financial Debt - Carrying Amount and Fair Value of Debt (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2019 | Jan. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Automotive [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt |  |  | $ 15,091 | $ 13,435
Long-term Debt, Fair Value |  |  | 15,815 | 12,700
Finance lease liabilities |  |  | 356 | 528
Finance lease liabilities, Fair Value |  |  | 565 | 831
Carrying Amount |  |  | 15,447 | 13,963
Fair Value |  |  | 16,380 | 13,531
Automotive [Member] | Level 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair Value |  |  | 13,022 | 11,693
Automotive [Member] | Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair Value |  |  | 3,358 | 1,838
GM Financial [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Amount |  |  | 91,114 | 90,988
Fair Value |  |  | 92,727 | 90,391
GM Financial [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Amount |  |  | 41,047 | 42,835
Fair Value |  |  | 41,273 | 42,835
GM Financial [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Amount |  |  | 50,067 | 48,153
Fair Value |  |  | 51,454 | 47,556
GM Financial [Member] | Level 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair Value |  |  | 90,699 | 88,305
GM Financial [Member] | Level 3 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair Value |  |  | $ 2,028 | $ 2,086
Line of Credit [Member] | GM Financial [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Term | 364 days |  |  |
Line of Credit [Member] | Three-Year Revolving Credit Facility January 2019 [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Term |  | 3 years |  |

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- Definition Amount of short-term and long-term debt and lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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 4: 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 + Details
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