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Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2018
GM Financial [Member] | Minimum [Member] | Vehicles [Member]
Equipment on Operating Leases, net [Abstract]
Leasing arrangements, contract term	2 years
GM Financial [Member] | Maximum [Member] | Vehicles [Member]
Equipment on Operating Leases, net [Abstract]
Leasing arrangements, contract term	5 years
GM Financial [Member] | Retail Finance Receivables [Member]
Revenue Recognition [Abstract]
Past due threshold term for suspending accrual of finance charge income	60 days
GM Financial [Member] | Commercial Finance Receivables [Member]
Revenue Recognition [Abstract]
Past due threshold term for suspending accrual of finance charge income	90 days
Automotive [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue recognition term, separate and bundled services (less than)	3 years
Automotive [Member] | Vehicles [Member]
Equipment on Operating Leases, net [Abstract]
Leasing arrangements, contract term	7 months

X

- Definition

Equipment on Operating Leases, net [Abstract]

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No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Maximum period past due before the accrual of finance charge income is suspended.

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No definition available.

+ Details

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X

- Definition

Revenue Recognition, Separate and Bundled Services, Term

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No definition available.

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Balance Type:	na
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X

- Definition

Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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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.

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No definition available.

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- References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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