Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Consumer) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	$ 128,457		$ 122,268
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	103,683		98,226
Consumer | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	23,895		46,869
Year two, originated, fiscal year before current fiscal year	40,260		20,088
Year three, originated, two years before current fiscal year	15,899		13,015
Year four, originated, three years before current fiscal year	9,956		7,800
Year five, originated, four years before current fiscal year	5,642		4,661
Originated, more than five years before current fiscal year	6,562		4,562
Revolving loans	1,441		1,197
Revolving loans converted to term	21		27
Total finance receivables and loans	103,676		98,219
Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	21,479		35,802
Year two, originated, fiscal year before current fiscal year	28,848		17,736
Year three, originated, two years before current fiscal year	13,797		12,010
Year four, originated, three years before current fiscal year	9,083		7,028
Year five, originated, four years before current fiscal year	5,010		3,610
Originated, more than five years before current fiscal year	3,474		2,066
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	81,691		78,252
Consumer | Mortgage/Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1,576		10,227
Year two, originated, fiscal year before current fiscal year	10,829		2,215
Year three, originated, two years before current fiscal year	2,021		986
Year four, originated, three years before current fiscal year	864		767
Year five, originated, four years before current fiscal year	630		1,050
Originated, more than five years before current fiscal year	3,087		2,496
Revolving loans	217		244
Revolving loans converted to term	21		27
Total finance receivables and loans	19,245		18,012
Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1,576		10,227
Year two, originated, fiscal year before current fiscal year	10,829		2,215
Year three, originated, two years before current fiscal year	2,021		986
Year four, originated, three years before current fiscal year	864		767
Year five, originated, four years before current fiscal year	630		1,050
Originated, more than five years before current fiscal year	3,003		2,399
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	18,923		17,644
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	84		97
Revolving loans	217		244
Revolving loans converted to term	21		27
Total finance receivables and loans	322		368
Consumer | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	2,747		1,962
Finance receivables, fair value	7	$ 7	7	$ 8	$ 8
Consumer | Other | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	840		840
Year two, originated, fiscal year before current fiscal year	583		137
Year three, originated, two years before current fiscal year	81		19
Year four, originated, three years before current fiscal year	9		5
Year five, originated, four years before current fiscal year	2		1
Originated, more than five years before current fiscal year	1		0
Revolving loans	1,224		953
Revolving loans converted to term	0		0
Total finance receivables and loans	2,740		1,955
Consumer | Personal Lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total finance receivables and loans	1,523		1,009
Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	840		840
Year two, originated, fiscal year before current fiscal year	583		137
Year three, originated, two years before current fiscal year	81		19
Year four, originated, three years before current fiscal year	9		5
Year five, originated, four years before current fiscal year	2		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	1,516		1,002
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	1,224		953
Revolving loans converted to term	0		0
Total finance receivables and loans	1,224		953
Current | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	21,265		35,222
Year two, originated, fiscal year before current fiscal year	27,856		17,218
Year three, originated, two years before current fiscal year	13,276		11,512
Year four, originated, three years before current fiscal year	8,651		6,692
Year five, originated, four years before current fiscal year	4,735		3,403
Originated, more than five years before current fiscal year	3,225		1,911
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	79,008		75,958
Current | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1,565		10,169
Year two, originated, fiscal year before current fiscal year	10,777		2,212
Year three, originated, two years before current fiscal year	2,017		977
Year four, originated, three years before current fiscal year	854		744
Year five, originated, four years before current fiscal year	617		1,041
Originated, more than five years before current fiscal year	2,965		2,363
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	18,795		17,506
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	68		79
Revolving loans	212		238
Revolving loans converted to term	19		23
Total finance receivables and loans	299		340
Current | Consumer | Personal Lending | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	830		821
Year two, originated, fiscal year before current fiscal year	568		133
Year three, originated, two years before current fiscal year	79		18
Year four, originated, three years before current fiscal year	9		5
Year five, originated, four years before current fiscal year	2		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	1,489		978
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	1,189		932
Revolving loans converted to term	0		0
Total finance receivables and loans	1,189		932
Financing receivables, 30 to 59 days past due | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	168		424
Year two, originated, fiscal year before current fiscal year	701		353
Year three, originated, two years before current fiscal year	355		334
Year four, originated, three years before current fiscal year	297		226
Year five, originated, four years before current fiscal year	188		139
Originated, more than five years before current fiscal year	166		101
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	1,875		1,577
Financing receivables, 30 to 59 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	10		50
Year two, originated, fiscal year before current fiscal year	49		3
Year three, originated, two years before current fiscal year	4		3
Year four, originated, three years before current fiscal year	5		7
Year five, originated, four years before current fiscal year	3		2
Originated, more than five years before current fiscal year	20		12
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	91		77
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	3		2
Revolving loans	1		1
Revolving loans converted to term	0		0
Total finance receivables and loans	4		3
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	5		9
Year two, originated, fiscal year before current fiscal year	7		2
Year three, originated, two years before current fiscal year	1		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	13		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		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	11		6
Revolving loans converted to term	0		0
Total finance receivables and loans	11		6
Financing receivables, 60 to 89 days past due | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	36		115
Year two, originated, fiscal year before current fiscal year	215		114
Year three, originated, two years before current fiscal year	123		108
Year four, originated, three years before current fiscal year	95		70
Year five, originated, four years before current fiscal year	59		41
Originated, more than five years before current fiscal year	49		28
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	577		476
Financing receivables, 60 to 89 days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		8
Year two, originated, fiscal year before current fiscal year	1		0
Year three, originated, two years before current fiscal year	0		1
Year four, originated, three years before current fiscal year	0		0
Year five, originated, four years before current fiscal year	2		0
Originated, more than five years before current fiscal year	3		5
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	6		14
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		1
Revolving loans	0		0
Revolving loans converted to term	0		1
Total finance receivables and loans	1		2
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	3		6
Year two, originated, fiscal year before current fiscal year	5		1
Year three, originated, two years before current fiscal year	1		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	9		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		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	8		5
Revolving loans converted to term	0		0
Total finance receivables and loans	8		5
Financing receivables, 90 or more days past due | Consumer | Automotive
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	10		41
Year two, originated, fiscal year before current fiscal year	76		51
Year three, originated, two years before current fiscal year	43		56
Year four, originated, three years before current fiscal year	40		40
Year five, originated, four years before current fiscal year	28		27
Originated, more than five years before current fiscal year	34		26
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	231		241
Financing receivables, 90 or more days past due | Consumer | Mortgage Finance
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1		0
Year two, originated, fiscal year before current fiscal year	2		0
Year three, originated, two years before current fiscal year	0		5
Year four, originated, three years before current fiscal year	5		16
Year five, originated, four years before current fiscal year	8		7
Originated, more than five years before current fiscal year	15		19
Revolving loans	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	31		47
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	12		15
Revolving loans	4		5
Revolving loans converted to term	2		3
Total finance receivables and loans	18		23
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	2		4
Year two, originated, fiscal year before current fiscal year	3		1
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	0		0
Revolving loans converted to term	0		0
Total finance receivables and loans	5		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		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	16		10
Revolving loans converted to term	0		0
Total finance receivables and loans	$ 16		$ 10