Finance Receivables, Net - Schedule of Amortized Cost Basis of Retail Loan Portfolio and Dealer Products Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	$ 254	$ 2,180
Year two, originated, fiscal year before current fiscal year	2,108	1,349
Year three, originated, two years before current fiscal year	1,245	1,241
Year four, originated, three years before current fiscal year	1,213	264
Year five, originated, four years before current fiscal year	248	424
Originated, more than five years before current fiscal year	1,242	940
Revolving loans	6,659	5,725
Total	12,969	12,123
Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	9,985	32,820
Year two, originated, fiscal year before current fiscal year	30,297	23,222
Year three, originated, two years before current fiscal year	21,112	14,678
Year four, originated, three years before current fiscal year	13,074	5,731
Year five, originated, four years before current fiscal year	4,900	2,279
Originated, more than five years before current fiscal year	2,370	916
Total	81,738	79,646
Gross Charge-Offs, year one, originated, current fiscal year	0
Gross Charge-Offs, Year two, originated, fiscal year before current fiscal year	(38)
Gross Charge-Offs, Year three, originated, two years before current fiscal year	(54)
Gross Charge-Offs, Year four, originated, three years before current fiscal year	(24)
Gross Charge-Offs, Year five, originated, four years before current fiscal year	(9)
Gross Charge-Offs, Originated, more than five years before current fiscal year	(9)
Gross Charge-Offs, Total	(134)
Current [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	9,968	32,377
Year two, originated, fiscal year before current fiscal year	29,719	22,585
Year three, originated, two years before current fiscal year	20,464	14,278
Year four, originated, three years before current fiscal year	12,666	5,555
Year five, originated, four years before current fiscal year	4,737	2,178
Originated, more than five years before current fiscal year	2,225	846
Total	79,779	77,819
30-59 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	17	306
Year two, originated, fiscal year before current fiscal year	393	439
Year three, originated, two years before current fiscal year	442	285
Year four, originated, three years before current fiscal year	283	125
Year five, originated, four years before current fiscal year	113	71
Originated, more than five years before current fiscal year	94	44
Total	1,342	1,270
60-89 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year		90
Year two, originated, fiscal year before current fiscal year	126	135
Year three, originated, two years before current fiscal year	146	82
Year four, originated, three years before current fiscal year	92	35
Year five, originated, four years before current fiscal year	36	21
Originated, more than five years before current fiscal year	33	15
Total	433	378
90 Days or Greater Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year		47
Year two, originated, fiscal year before current fiscal year	59	63
Year three, originated, two years before current fiscal year	60	33
Year four, originated, three years before current fiscal year	33	16
Year five, originated, four years before current fiscal year	14	9
Originated, more than five years before current fiscal year	18	11
Total	184	179
Wholesale [Member]
Financing Receivable, Recorded Investment [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	4,586	3,964
Total	4,586	3,964
Wholesale [Member] | Performing [Member]
Financing Receivable, Recorded Investment [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	4,407	3,859
Total	4,407	3,859
Wholesale [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [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	85	54
Total	85	54
Wholesale [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [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	93	0
Total	93	0
Wholesale [Member] | Default [Member]
Financing Receivable, Recorded Investment [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	0
Total	1	0
Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	159	1,391
Year two, originated, fiscal year before current fiscal year	1,345	1,031
Year three, originated, two years before current fiscal year	958	1,059
Year four, originated, three years before current fiscal year	1,040	133
Year five, originated, four years before current fiscal year	132	300
Originated, more than five years before current fiscal year	1,038	852
Revolving loans	185	209
Total	4,857	4,975
Real estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	150	1,378
Year two, originated, fiscal year before current fiscal year	1,260	1,024
Year three, originated, two years before current fiscal year	951	1,057
Year four, originated, three years before current fiscal year	1,008	133
Year five, originated, four years before current fiscal year	132	300
Originated, more than five years before current fiscal year	1,036	850
Revolving loans	185	209
Total	4,722	4,951
Real estate [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	9	5
Year two, originated, fiscal year before current fiscal year	78	0
Year three, originated, two years before current fiscal year	0	2
Year four, originated, three years before current fiscal year	8	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
Total	95	7
Real estate [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	0	8
Year two, originated, fiscal year before current fiscal year	7	7
Year three, originated, two years before current fiscal year	7	0
Year four, originated, three years before current fiscal year	24	0
Year five, originated, four years before current fiscal year	0	0
Originated, more than five years before current fiscal year	2	2
Revolving loans	0	0
Total	40	17
Real estate [Member] | Default [Member]
Financing Receivable, Recorded Investment [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	0	0
Total	0	0
Working capital [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	95	789
Year two, originated, fiscal year before current fiscal year	763	318
Year three, originated, two years before current fiscal year	287	182
Year four, originated, three years before current fiscal year	173	131
Year five, originated, four years before current fiscal year	116	124
Originated, more than five years before current fiscal year	204	88
Revolving loans	1,888	1,552
Total	3,526	3,184
Working capital [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	79	789
Year two, originated, fiscal year before current fiscal year	721	317
Year three, originated, two years before current fiscal year	286	182
Year four, originated, three years before current fiscal year	160	131
Year five, originated, four years before current fiscal year	116	124
Originated, more than five years before current fiscal year	204	88
Revolving loans	1,886	1,552
Total	3,452	3,183
Working capital [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	16	0
Year two, originated, fiscal year before current fiscal year	41	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	2	0
Total	59	0
Working capital [Member] | At Risk [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	1	1
Year three, originated, two years before current fiscal year	1	0
Year four, originated, three years before current fiscal year	13	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
Total	15	1
Working capital [Member] | Default [Member]
Financing Receivable, Recorded Investment [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	0	0
Total	$ 0	$ 0