Finance Receivables, Net - Schedule of Amortized Cost Basis of Retail Loan Portfolio and Dealer Products Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Millions	Dec. 31, 2022	Mar. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	$ 1,522	$ 2,279
Year two, originated, fiscal year before current fiscal year	1,596	1,567
Year three, originated, two years before current fiscal year	1,284	473
Year four, originated, three years before current fiscal year	294	542
Year five, originated, four years before current fiscal year	458	297
Originated, more than five years before current fiscal year	1,141	1,423
Revolving loans	5,506	3,717
Total	11,801	10,298
Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	26,370	32,758
Year two, originated, fiscal year before current fiscal year	25,400	22,342
Year three, originated, two years before current fiscal year	16,370	9,834
Year four, originated, three years before current fiscal year	6,621	4,913
Year five, originated, four years before current fiscal year	2,847	2,761
Originated, more than five years before current fiscal year	1,369	772
Total	78,977	73,380
Current [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	26,023	32,382
Year two, originated, fiscal year before current fiscal year	24,645	21,917
Year three, originated, two years before current fiscal year	15,847	9,624
Year four, originated, three years before current fiscal year	6,395	4,774
Year five, originated, four years before current fiscal year	2,713	2,674
Originated, more than five years before current fiscal year	1,266	718
Total	76,889	72,089
30-59 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	245	275
Year two, originated, fiscal year before current fiscal year	518	304
Year three, originated, two years before current fiscal year	360	153
Year four, originated, three years before current fiscal year	158	101
Year five, originated, four years before current fiscal year	92	63
Originated, more than five years before current fiscal year	66	36
Total	1,439	932
60-89 Days Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	69	68
Year two, originated, fiscal year before current fiscal year	155	82
Year three, originated, two years before current fiscal year	111	40
Year four, originated, three years before current fiscal year	46	25
Year five, originated, four years before current fiscal year	29	16
Originated, more than five years before current fiscal year	22	11
Total	432	242
90 Days or Greater Past Due [Member] | Retail Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	33	33
Year two, originated, fiscal year before current fiscal year	82	39
Year three, originated, two years before current fiscal year	52	17
Year four, originated, three years before current fiscal year	22	13
Year five, originated, four years before current fiscal year	13	8
Originated, more than five years before current fiscal year	15	7
Total	217	117
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	3,890	2,943
Total	3,890	2,943
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	3,858	2,927
Total	3,858	2,927
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	30	16
Total	30	16
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	2	0
Total	2	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	0	0
Total	0	0
Real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	992	1,616
Year two, originated, fiscal year before current fiscal year	1,213	1,245
Year three, originated, two years before current fiscal year	1,083	264
Year four, originated, three years before current fiscal year	148	384
Year five, originated, four years before current fiscal year	331	260
Originated, more than five years before current fiscal year	1,021	1,250
Revolving loans	109	0
Total	4,897	5,019
Real estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	987	1,614
Year two, originated, fiscal year before current fiscal year	1,213	1,245
Year three, originated, two years before current fiscal year	1,083	264
Year four, originated, three years before current fiscal year	148	384
Year five, originated, four years before current fiscal year	331	260
Originated, more than five years before current fiscal year	1,021	1,245
Revolving loans	109	0
Total	4,892	5,012
Real estate [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	5	2
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	5
Revolving loans	0	0
Total	5	7
Real estate [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	0	0
Total	0	0
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	530	663
Year two, originated, fiscal year before current fiscal year	383	322
Year three, originated, two years before current fiscal year	201	209
Year four, originated, three years before current fiscal year	146	158
Year five, originated, four years before current fiscal year	127	37
Originated, more than five years before current fiscal year	120	173
Revolving loans	1,507	774
Total	3,014	2,336
Working capital [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	530	662
Year two, originated, fiscal year before current fiscal year	383	321
Year three, originated, two years before current fiscal year	201	209
Year four, originated, three years before current fiscal year	146	158
Year five, originated, four years before current fiscal year	127	37
Originated, more than five years before current fiscal year	120	173
Revolving loans	1,507	774
Total	3,014	2,334
Working capital [Member] | Credit Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Year one, originated, current fiscal year	0	1
Year two, originated, fiscal year before current fiscal year	0	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
Total	0	2
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	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] | 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