Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - GM Financial - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Derivative [Line Items]
Notional	$ 159,814	$ 163,446
Fair Value of Assets	1,499	1,809
Fair Value of Liabilities	2,689	2,563
Collateral	436	457
Collateral available for netting	1,300	1,200
Cash Flow Hedges \| Foreign currency
Derivative [Line Items]
Loss recognized in AOCI	215
Loss on AOCI reclassification	212
Designated as Hedges \| Fair Value Hedges \| Interest rate swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	33,285	18,379
Fair Value of Assets	4	75
Fair Value of Liabilities	456	238
Designated as Hedges \| Cash Flow Hedges \| Interest rate swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	1,964	2,381
Fair Value of Assets	21	17
Fair Value of Liabilities	3	16
Designated as Hedges \| Cash Flow Hedges \| Foreign currency swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	9,054	8,003
Fair Value of Assets	103	144
Fair Value of Liabilities	399	311
Not Designated as Hedges \| Interest rate contracts \| Fair Value Level 2
Derivative [Line Items]
Notional	115,512	134,683
Fair Value of Assets	1,371	1,573
Fair Value of Liabilities	$ 1,831	$ 1,997

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Publisher FASB
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