Finance Receivables and Loans, Net (Financing Receivable Gross Charge-Offs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
2023	$ 239
2022	1,034
2021	680
2020	197
2019	221
2018 and prior	151
Revolving loans	188
Revolving loans converted to term	10
Total	2,720	$ 1,628
Write-downs from transfers to held-for-sale	215
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2023	239
2022	1,034
2021	680
2020	197
2019	142
2018 and prior	123
Revolving loans	165
Revolving loans converted to term	10
Total	2,590
Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
2023	225
2022	952
2021	651
2020	194
2019	142
2018 and prior	120
Revolving loans	0
Revolving loans converted to term	0
Total	2,284	1,434
Write-downs from transfers to held-for-sale	41
Consumer | Consumer mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
2018 and prior	3
Revolving loans	0
Revolving loans converted to term	0
Total	3	3
Write-downs from transfers to held-for-sale	0
Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
2018 and prior	1
Revolving loans	0
Revolving loans converted to term	0
Total	1
Consumer | Mortgage — Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
2018 and prior	2
Revolving loans	0
Revolving loans converted to term	0
Total	2
Consumer | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	14
2022	82
2021	29
2020	3
2019	0
2018 and prior	0
Revolving loans	165
Revolving loans converted to term	10
Total	303	133
Write-downs from transfers to held-for-sale	174
Consumer | Personal Lending
Financing Receivable, Credit Quality Indicator [Line Items]
2023	14
2022	82
2021	29
2020	3
2019	0
2018 and prior	0
Revolving loans	0
Revolving loans converted to term	0
Total	128
Consumer | Credit Card
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
2018 and prior	0
Revolving loans	165
Revolving loans converted to term	10
Total	175
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	79
2018 and prior	28
Revolving loans	23
Revolving loans converted to term	0
Total	130	$ 58
Write-downs from transfers to held-for-sale	0
Commercial | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	0
2018 and prior	5
Revolving loans	19
Revolving loans converted to term	0
Total	24
Commercial | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2023	0
2022	0
2021	0
2020	0
2019	79
2018 and prior	23
Revolving loans	4
Revolving loans converted to term	0
Total	$ 106