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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
GM Financial [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | $ 54,189 |  | $ 54,189 |  | $ 51,933
GM Financial [Member] | Commercial Finance Receivables [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | 12,479 |  | 12,479 |  | 12,209
GM Financial [Member] | Retail Finance Receivables [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | 41,710 |  | 41,710 |  | 39,724
Intersegment Eliminations [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cash payments to GM Financial | 959 | $ 1,100 | 2,000 | $ 1,700 |
Intersegment Eliminations [Member] | GM Financial [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Subvention receivable | 705 |  | 705 |  | 727
Interest subvention earned on finance receivables | 147 | 137 | 295 | 267 |
Leased vehicle subvention earned | 818 | $ 813 | 1,653 | $ 1,611 |
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | 491 |  | 491 |  | 445
Commercial loan funding payable | 66 |  | 66 |  | 61
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Financing receivable, net | $ 108 |  | $ 108 |  | $ 134

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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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