Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Consumer) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	$ 136,304	$ 135,748
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	106,815	106,610
Consumer | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	8,231	40,946
Year two, originated, fiscal year before current fiscal year	38,505	34,750
Year three, originated, two years before current fiscal year	32,370	12,893
Year four, originated, three years before current fiscal year	11,647	7,698
Year five, originated, four years before current fiscal year	6,738	4,071
Originated, more than five years before current fiscal year	7,836	4,994
Revolving loans	1,821	1,794
Revolving loans converted to term	20	21
Total finance receivables and loans	107,168	107,167
Consumer | Consumer automotive, excludes basis adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	7,825	37,114
Year two, originated, fiscal year before current fiscal year	34,923	23,415
Year three, originated, two years before current fiscal year	21,218	10,893
Year four, originated, three years before current fiscal year	9,686	6,872
Year five, originated, four years before current fiscal year	5,935	3,480
Originated, more than five years before current fiscal year	4,408	2,072
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	83,995	83,846
Basis adjustment for active hedge	355	560
Consumer | Consumer mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	21	2,309
Year two, originated, fiscal year before current fiscal year	2,279	10,927
Year three, originated, two years before current fiscal year	10,812	1,950
Year four, originated, three years before current fiscal year	1,922	821
Year five, originated, four years before current fiscal year	799	590
Originated, more than five years before current fiscal year	3,427	2,922
Revolving loans	181	195
Revolving loans converted to term	20	21
Total finance receivables and loans	19,461	19,735
Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	21	2,309
Year two, originated, fiscal year before current fiscal year	2,279	10,927
Year three, originated, two years before current fiscal year	10,812	1,950
Year four, originated, three years before current fiscal year	1,922	821
Year five, originated, four years before current fiscal year	799	590
Originated, more than five years before current fiscal year	3,356	2,848
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	19,189	19,445
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	71	74
Revolving loans	181	195
Revolving loans converted to term	20	21
Total finance receivables and loans	272	290
Consumer | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	3,714	3,589
Fair value, option, carrying amount, financing receivable, no allowance	2	3	$ 7	$ 7
Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	385	1,523
Year two, originated, fiscal year before current fiscal year	1,303	408
Year three, originated, two years before current fiscal year	340	50
Year four, originated, three years before current fiscal year	39	5
Year five, originated, four years before current fiscal year	4	1
Originated, more than five years before current fiscal year	1	0
Revolving loans	1,640	1,599
Revolving loans converted to term	0	0
Total finance receivables and loans	3,712	3,586
Consumer | Personal Lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	2,074	1,990
Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	385	1,523
Year two, originated, fiscal year before current fiscal year	1,303	408
Year three, originated, two years before current fiscal year	340	50
Year four, originated, three years before current fiscal year	39	5
Year five, originated, four years before current fiscal year	4	1
Originated, more than five years before current fiscal year	1	0
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	2,072	1,987
Consumer | Credit card receivables
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	0	0
Revolving loans	1,640	1,599
Revolving loans converted to term	0	0
Total finance receivables and loans	1,640	1,599
Current | Consumer | Consumer automotive, excludes basis adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	7,801	36,127
Year two, originated, fiscal year before current fiscal year	33,822	22,102
Year three, originated, two years before current fiscal year	20,093	10,341
Year four, originated, three years before current fiscal year	9,232	6,451
Year five, originated, four years before current fiscal year	5,604	3,237
Originated, more than five years before current fiscal year	4,098	1,890
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	80,650	80,148
Current | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	21	2,292
Year two, originated, fiscal year before current fiscal year	2,271	10,893
Year three, originated, two years before current fiscal year	10,797	1,946
Year four, originated, three years before current fiscal year	1,917	815
Year five, originated, four years before current fiscal year	794	577
Originated, more than five years before current fiscal year	3,316	2,805
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	19,116	19,328
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	59	62
Revolving loans	177	191
Revolving loans converted to term	18	18
Total finance receivables and loans	254	271
Current | Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	384	1,492
Year two, originated, fiscal year before current fiscal year	1,272	392
Year three, originated, two years before current fiscal year	327	48
Year four, originated, three years before current fiscal year	39	5
Year five, originated, four years before current fiscal year	4	1
Originated, more than five years before current fiscal year	1	0
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	2,027	1,938
Current | Consumer | Credit card receivables
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	0	0
Revolving loans	1,548	1,518
Revolving loans converted to term	0	0
Total finance receivables and loans	1,548	1,518
30–59 days past due | Consumer | Consumer automotive, excludes basis adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	23	707
Year two, originated, fiscal year before current fiscal year	769	878
Year three, originated, two years before current fiscal year	756	370
Year four, originated, three years before current fiscal year	308	284
Year five, originated, four years before current fiscal year	226	165
Originated, more than five years before current fiscal year	210	120
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	2,292	2,524
30–59 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	15
Year two, originated, fiscal year before current fiscal year	5	29
Year three, originated, two years before current fiscal year	9	4
Year four, originated, three years before current fiscal year	4	3
Year five, originated, four years before current fiscal year	4	4
Originated, more than five years before current fiscal year	16	26
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	38	81
30–59 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	1
Revolving loans converted to term	0	0
Total finance receivables and loans	3	5
30–59 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	1	14
Year two, originated, fiscal year before current fiscal year	12	6
Year three, originated, two years before current fiscal year	5	1
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	0	0
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	18	21
30–59 days past due | Consumer | Credit card receivables
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	0	0
Revolving loans	22	22
Revolving loans converted to term	0	0
Total finance receivables and loans	22	22
60–89 days past due | Consumer | Consumer automotive, excludes basis adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1	207
Year two, originated, fiscal year before current fiscal year	244	324
Year three, originated, two years before current fiscal year	273	135
Year four, originated, three years before current fiscal year	108	99
Year five, originated, four years before current fiscal year	74	55
Originated, more than five years before current fiscal year	65	38
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	765	858
60–89 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	2
Year two, originated, fiscal year before current fiscal year	1	4
Year three, originated, two years before current fiscal year	2	0
Year four, originated, three years before current fiscal year	1	1
Year five, originated, four years before current fiscal year	0	1
Originated, more than five years before current fiscal year	8	3
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	12	11
60–89 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	2	0
Revolving loans	1	0
Revolving loans converted to term	0	1
Total finance receivables and loans	3	1
60–89 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	0	9
Year two, originated, fiscal year before current fiscal year	11	5
Year three, originated, two years before current fiscal year	4	1
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	0	0
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	15	15
60–89 days past due | Consumer | Credit card receivables
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	0	0
Revolving loans	19	18
Revolving loans converted to term	0	0
Total finance receivables and loans	19	18
90 or more days past due | Consumer | Consumer automotive, excludes basis adjustment
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	73
Year two, originated, fiscal year before current fiscal year	88	111
Year three, originated, two years before current fiscal year	96	47
Year four, originated, three years before current fiscal year	38	38
Year five, originated, four years before current fiscal year	31	23
Originated, more than five years before current fiscal year	35	24
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	288	316
90 or more days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	2	1
Year three, originated, two years before current fiscal year	4	0
Year four, originated, three years before current fiscal year	0	2
Year five, originated, four years before current fiscal year	1	8
Originated, more than five years before current fiscal year	16	14
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	23	25
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	8	8
Revolving loans	2	3
Revolving loans converted to term	2	2
Total finance receivables and loans	12	13
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	0	8
Year two, originated, fiscal year before current fiscal year	8	5
Year three, originated, two years before current fiscal year	4	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	0	0
Revolving loans	0	0
Revolving loans converted to term	0	0
Total finance receivables and loans	12	13
90 or more days past due | Consumer | Credit card receivables
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	0	0
Revolving loans	51	41
Revolving loans converted to term	0	0
Total finance receivables and loans	$ 51	$ 41