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GM Financial Receivables and Transactions Intercompany Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
GM Financial [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 52,678		$ 51,933
GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	11,876		12,209
GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	40,802		39,724
Intersegment Eliminations [Member]
Related Party Transaction [Line Items]
Cash payments to GM Financial	(1,100)	$ (642)
Intersegment Eliminations [Member] | GM Financial [Member]
Related Party Transaction [Line Items]
Subvention receivable	639		727
Interest subvention earned on finance receivables	148	130
Leased vehicle subvention earned	835	$ 798
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	430		445
Commercial loan funding payable	57		61
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	$ 121		$ 134

X

- Definition

Intercompany Payable

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Intercompany Receivable

+ References

No definition available.

+ Details

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X

- Definition

Intercompany Transactions, Leased Vehicle Income Earned

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Interest Income, Intercompany Transactions

+ References

No definition available.

+ Details

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X

- Definition

Intersegment Eliminations, Receivables (Payables), Net

+ References

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+ Details

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- 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.

+ Details

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X

- Details

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X

- Details

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- Details

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- Details

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