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GM Financial Receivables and Transactions Intercompany Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
GM Financial [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 45,001		$ 45,001		$ 41,729
GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	10,261		10,261		9,904
GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	34,740		34,740		31,825
Intersegment Eliminations [Member]
Related Party Transaction [Line Items]
Cash payments to GM Financial	1,100	$ 1,200	1,700	$ 2,200
Intersegment Eliminations [Member] | GM Financial [Member]
Related Party Transaction [Line Items]
Subvention receivable	735		735		306
Interest subvention earned on finance receivables	137	122	267	232
Leased vehicle subvention earned	813	$ 754	1,611	$ 1,460
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	379		379		355
Commercial loan funding payable	75		75		90
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 120		$ 120		$ 88

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- Definition

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+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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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.

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