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Finance Receivables and Loans, Net - Schedule of Financing Receivables, Nonaccrual Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 1,486	$ 1,394	$ 1,454
Financing receivable, nonaccrual, with no allowance	518	585
Financing receivable, nonaccrual, interest income	17	16
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,375	1,275	1,292
Financing receivable, nonaccrual, with no allowance	512	564
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,231	1,129	1,187
Financing receivable, nonaccrual, with no allowance	476	531
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	54	54	49
Financing receivable, nonaccrual, with no allowance	36	33
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	90	92	56
Financing receivable, nonaccrual, with no allowance	0	0
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status		0	13
Financing receivable, nonaccrual, with no allowance		0
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	90	92	43
Financing receivable, nonaccrual, with no allowance	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	111	119	162
Financing receivable, nonaccrual, with no allowance	6	21
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	15	18	5
Financing receivable, nonaccrual, with no allowance	0	13
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	2	3	0
Financing receivable, nonaccrual, with no allowance	2	3
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	94	98	$ 157
Financing receivable, nonaccrual, with no allowance	$ 4	$ 5

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 16
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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