Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Consumer) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	$ 122,268	$ 118,534
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	98,226	89,202
Consumer | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	46,869	31,399
Year two, originated, fiscal year before current fiscal year	20,088	22,426
Year three, originated, two years before current fiscal year	13,015	14,509
Year four, originated, three years before current fiscal year	7,800	9,765
Year five, originated, four years before current fiscal year	4,661	5,143
Originated, more than five years before current fiscal year	4,562	5,604
Revolving loans	1,197	310
Revolving loans converted to term	27	38
Total finance receivables and loans	98,219	89,194
Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	35,802	27,634
Year two, originated, fiscal year before current fiscal year	17,736	19,943
Year three, originated, two years before current fiscal year	12,010	12,730
Year four, originated, three years before current fiscal year	7,028	7,483
Year five, originated, four years before current fiscal year	3,610	3,953
Originated, more than five years before current fiscal year	2,066	1,925
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	78,252	73,668
Consumer | Mortgage/Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	10,227	3,444
Year two, originated, fiscal year before current fiscal year	2,215	2,425
Year three, originated, two years before current fiscal year	986	1,765
Year four, originated, three years before current fiscal year	767	2,277
Year five, originated, four years before current fiscal year	1,050	1,189
Originated, more than five years before current fiscal year	2,496	3,679
Revolving loans	244	310
Revolving loans converted to term	27	38
Total finance receivables and loans	18,012	15,127
Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	10,227	3,444
Year two, originated, fiscal year before current fiscal year	2,215	2,425
Year three, originated, two years before current fiscal year	986	1,765
Year four, originated, three years before current fiscal year	767	2,277
Year five, originated, four years before current fiscal year	1,050	1,189
Originated, more than five years before current fiscal year	2,399	3,532
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	17,644	14,632
Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	0	0
Year three, originated, two years before current fiscal year	0	0
Year four, originated, three years before current fiscal year	0	0
Year five, originated, four years before current fiscal year	0	0
Originated, more than five years before current fiscal year	97	147
Revolving loans	244	310
Revolving loans converted to term	27	38
Total finance receivables and loans	368	495
Consumer | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	1,962	407
Finance receivables, fair value	7	8	$ 11
Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	840	321
Year two, originated, fiscal year before current fiscal year	137	58
Year three, originated, two years before current fiscal year	19	14
Year four, originated, three years before current fiscal year	5	5
Year five, originated, four years before current fiscal year	1	1
Originated, more than five years before current fiscal year	0	0
Revolving loans	953	0
Revolving loans converted to term	0	0
Total finance receivables and loans	1,955	399
Consumer | Personal Lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	1,009	407
Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	840
Year two, originated, fiscal year before current fiscal year	137
Year three, originated, two years before current fiscal year	19
Year four, originated, three years before current fiscal year	5
Year five, originated, four years before current fiscal year	1
Originated, more than five years before current fiscal year	0
Revolving loans	0
Revolving loans converted to term	0
Total finance receivables and loans	1,002
Consumer | Credit card receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0
Year two, originated, fiscal year before current fiscal year	0
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	953
Revolving loans converted to term	0
Total finance receivables and loans	953	0
Current | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	35,222	27,255
Year two, originated, fiscal year before current fiscal year	17,218	19,204
Year three, originated, two years before current fiscal year	11,512	12,129
Year four, originated, three years before current fiscal year	6,692	7,060
Year five, originated, four years before current fiscal year	3,403	3,678
Originated, more than five years before current fiscal year	1,911	1,766
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	75,958	71,092
Current | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	10,169	3,432
Year two, originated, fiscal year before current fiscal year	2,212	2,410
Year three, originated, two years before current fiscal year	977	1,744
Year four, originated, three years before current fiscal year	744	2,254
Year five, originated, four years before current fiscal year	1,041	1,177
Originated, more than five years before current fiscal year	2,363	3,492
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	17,506	14,509
Current | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	0	0
Year three, originated, two years before current fiscal year	0	0
Year four, originated, three years before current fiscal year	0	0
Year five, originated, four years before current fiscal year	0	0
Originated, more than five years before current fiscal year	79	121
Revolving loans	238	303
Revolving loans converted to term	23	36
Total finance receivables and loans	340	460
Current | Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year		306
Year two, originated, fiscal year before current fiscal year		53
Year three, originated, two years before current fiscal year		13
Year four, originated, three years before current fiscal year		4
Year five, originated, four years before current fiscal year		1
Originated, more than five years before current fiscal year		0
Revolving loans		0
Revolving loans converted to term		0
Total finance receivables and loans		377
Current | Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	821
Year two, originated, fiscal year before current fiscal year	133
Year three, originated, two years before current fiscal year	18
Year four, originated, three years before current fiscal year	5
Year five, originated, four years before current fiscal year	1
Originated, more than five years before current fiscal year	0
Revolving loans	0
Revolving loans converted to term	0
Total finance receivables and loans	978
Current | Consumer | Credit card receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0
Year two, originated, fiscal year before current fiscal year	0
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	932
Revolving loans converted to term	0
Total finance receivables and loans	932
Financing receivables, 30 to 59 days past due | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	424	281
Year two, originated, fiscal year before current fiscal year	353	466
Year three, originated, two years before current fiscal year	334	376
Year four, originated, three years before current fiscal year	226	264
Year five, originated, four years before current fiscal year	139	174
Originated, more than five years before current fiscal year	101	97
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	1,577	1,658
Financing receivables, 30 to 59 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	50	10
Year two, originated, fiscal year before current fiscal year	3	9
Year three, originated, two years before current fiscal year	3	10
Year four, originated, three years before current fiscal year	7	11
Year five, originated, four years before current fiscal year	2	7
Originated, more than five years before current fiscal year	12	16
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	77	63
Financing receivables, 30 to 59 days past due | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	0	0
Year three, originated, two years before current fiscal year	0	0
Year four, originated, three years before current fiscal year	0	0
Year five, originated, four years before current fiscal year	0	0
Originated, more than five years before current fiscal year	2	4
Revolving loans	1	2
Revolving loans converted to term	0	0
Total finance receivables and loans	3	6
Financing receivables, 30 to 59 days past due | Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year		9
Year two, originated, fiscal year before current fiscal year		3
Year three, originated, two years before current fiscal year		1
Year four, originated, three years before current fiscal year		0
Year five, originated, four years before current fiscal year		0
Originated, more than five years before current fiscal year		0
Revolving loans		0
Revolving loans converted to term		0
Total finance receivables and loans		13
Financing receivables, 30 to 59 days past due | Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	9
Year two, originated, fiscal year before current fiscal year	2
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	0
Revolving loans converted to term	0
Total finance receivables and loans	11
Financing receivables, 30 to 59 days past due | Consumer | Credit card receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0
Year two, originated, fiscal year before current fiscal year	0
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	6
Revolving loans converted to term	0
Total finance receivables and loans	6
Financing receivables, 60 to 89 days past due | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	115	66
Year two, originated, fiscal year before current fiscal year	114	165
Year three, originated, two years before current fiscal year	108	129
Year four, originated, three years before current fiscal year	70	88
Year five, originated, four years before current fiscal year	41	55
Originated, more than five years before current fiscal year	28	32
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	476	535
Financing receivables, 60 to 89 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	8	1
Year two, originated, fiscal year before current fiscal year	0	1
Year three, originated, two years before current fiscal year	1	3
Year four, originated, three years before current fiscal year	0	2
Year five, originated, four years before current fiscal year	0	1
Originated, more than five years before current fiscal year	5	3
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	14	11
Financing receivables, 60 to 89 days past due | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	0	0
Year three, originated, two years before current fiscal year	0	0
Year four, originated, three years before current fiscal year	0	0
Year five, originated, four years before current fiscal year	0	0
Originated, more than five years before current fiscal year	1	2
Revolving loans	0	0
Revolving loans converted to term	1	0
Total finance receivables and loans	2	2
Financing receivables, 60 to 89 days past due | Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year		4
Year two, originated, fiscal year before current fiscal year		1
Year three, originated, two years before current fiscal year		0
Year four, originated, three years before current fiscal year		1
Year five, originated, four years before current fiscal year		0
Originated, more than five years before current fiscal year		0
Revolving loans		0
Revolving loans converted to term		0
Total finance receivables and loans		6
Financing receivables, 60 to 89 days past due | Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	6
Year two, originated, fiscal year before current fiscal year	1
Year three, originated, two years before current fiscal year	1
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	0
Revolving loans converted to term	0
Total finance receivables and loans	8
Financing receivables, 60 to 89 days past due | Consumer | Credit card receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0
Year two, originated, fiscal year before current fiscal year	0
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	5
Revolving loans converted to term	0
Total finance receivables and loans	5
Financing receivables, 90 or more days past due | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	41	32
Year two, originated, fiscal year before current fiscal year	51	108
Year three, originated, two years before current fiscal year	56	96
Year four, originated, three years before current fiscal year	40	71
Year five, originated, four years before current fiscal year	27	46
Originated, more than five years before current fiscal year	26	30
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	241	383
Financing receivables, 90 or more days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	1
Year two, originated, fiscal year before current fiscal year	0	5
Year three, originated, two years before current fiscal year	5	8
Year four, originated, three years before current fiscal year	16	10
Year five, originated, four years before current fiscal year	7	4
Originated, more than five years before current fiscal year	19	21
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	47	49
Financing receivables, 90 or more days past due | Consumer | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	0	0
Year three, originated, two years before current fiscal year	0	0
Year four, originated, three years before current fiscal year	0	0
Year five, originated, four years before current fiscal year	0	0
Originated, more than five years before current fiscal year	15	20
Revolving loans	5	5
Revolving loans converted to term	3	2
Total finance receivables and loans	23	27
Financing receivables, 90 or more days past due | Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year		2
Year two, originated, fiscal year before current fiscal year		1
Year three, originated, two years before current fiscal year		0
Year four, originated, three years before current fiscal year		0
Year five, originated, four years before current fiscal year		0
Originated, more than five years before current fiscal year		0
Revolving loans		0
Revolving loans converted to term		0
Total finance receivables and loans		$ 3
Financing receivables, 90 or more days past due | Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	4
Year two, originated, fiscal year before current fiscal year	1
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	0
Revolving loans converted to term	0
Total finance receivables and loans	5
Financing receivables, 90 or more days past due | Consumer | Credit card receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0
Year two, originated, fiscal year before current fiscal year	0
Year three, originated, two years before current fiscal year	0
Year four, originated, three years before current fiscal year	0
Year five, originated, four years before current fiscal year	0
Originated, more than five years before current fiscal year	0
Revolving loans	10
Revolving loans converted to term	0
Total finance receivables and loans	$ 10