Finance Receivables, Net - Schedule of Amortized Cost Basis of Retail Loan Portfolio and Dealer Products Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Mar. 31, 2022 |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | $ 842 | $ 2,279 |
Year two, originated, fiscal year before current fiscal year | 1,944 | 1,567 |
Year three, originated, two years before current fiscal year | 1,432 | 473 |
Year four, originated, three years before current fiscal year | 313 | 542 |
Year five, originated, four years before current fiscal year | 466 | 297 |
Originated, more than five years before current fiscal year | 1,276 | 1,423 |
Revolving loans | 4,792 | 3,717 |
Total | 11,065 | 10,298 |
Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 18,516 | 32,758 |
Year two, originated, fiscal year before current fiscal year | 27,628 | 22,342 |
Year three, originated, two years before current fiscal year | 18,109 | 9,834 |
Year four, originated, three years before current fiscal year | 7,552 | 4,913 |
Year five, originated, four years before current fiscal year | 3,448 | 2,761 |
Originated, more than five years before current fiscal year | 1,938 | 772 |
Total | 77,191 | 73,380 |
Current [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 18,374 | 32,382 |
Year two, originated, fiscal year before current fiscal year | 27,031 | 21,917 |
Year three, originated, two years before current fiscal year | 17,651 | 9,624 |
Year four, originated, three years before current fiscal year | 7,349 | 4,774 |
Year five, originated, four years before current fiscal year | 3,326 | 2,674 |
Originated, more than five years before current fiscal year | 1,834 | 718 |
Total | 75,565 | 72,089 |
30-59 Days Past Due [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 103 | 275 |
Year two, originated, fiscal year before current fiscal year | 406 | 304 |
Year three, originated, two years before current fiscal year | 317 | 153 |
Year four, originated, three years before current fiscal year | 142 | 101 |
Year five, originated, four years before current fiscal year | 84 | 63 |
Originated, more than five years before current fiscal year | 69 | 36 |
Total | 1,121 | 932 |
60-89 Days Past Due [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 27 | 68 |
Year two, originated, fiscal year before current fiscal year | 124 | 82 |
Year three, originated, two years before current fiscal year | 95 | 40 |
Year four, originated, three years before current fiscal year | 42 | 25 |
Year five, originated, four years before current fiscal year | 26 | 16 |
Originated, more than five years before current fiscal year | 21 | 11 |
Total | 335 | 242 |
90 Days or Greater Past Due [Member] | Retail Loan [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 12 | 33 |
Year two, originated, fiscal year before current fiscal year | 67 | 39 |
Year three, originated, two years before current fiscal year | 46 | 17 |
Year four, originated, three years before current fiscal year | 19 | 13 |
Year five, originated, four years before current fiscal year | 12 | 8 |
Originated, more than five years before current fiscal year | 14 | 7 |
Total | 170 | 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 | 3,460 | 2,943 |
Total | 3,460 | 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 | 3,444 | 2,927 |
Total | 3,444 | 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 | 16 | 16 |
Total | 16 | 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 | 0 | 0 |
Total | 0 | 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 | 563 | 1,616 |
Year two, originated, fiscal year before current fiscal year | 1,424 | 1,245 |
Year three, originated, two years before current fiscal year | 1,149 | 264 |
Year four, originated, three years before current fiscal year | 158 | 384 |
Year five, originated, four years before current fiscal year | 335 | 260 |
Originated, more than five years before current fiscal year | 1,140 | 1,250 |
Revolving loans | 138 | 0 |
Total | 4,907 | 5,019 |
Real estate [Member] | Performing [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 558 | 1,614 |
Year two, originated, fiscal year before current fiscal year | 1,424 | 1,245 |
Year three, originated, two years before current fiscal year | 1,149 | 264 |
Year four, originated, three years before current fiscal year | 158 | 384 |
Year five, originated, four years before current fiscal year | 335 | 260 |
Originated, more than five years before current fiscal year | 1,140 | 1,245 |
Revolving loans | 138 | 0 |
Total | 4,902 | 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 | 279 | 663 |
Year two, originated, fiscal year before current fiscal year | 520 | 322 |
Year three, originated, two years before current fiscal year | 283 | 209 |
Year four, originated, three years before current fiscal year | 155 | 158 |
Year five, originated, four years before current fiscal year | 131 | 37 |
Originated, more than five years before current fiscal year | 136 | 173 |
Revolving loans | 1,194 | 774 |
Total | 2,698 | 2,336 |
Working capital [Member] | Performing [Member] | | |
Financing Receivable, Recorded Investment [Line Items] | | |
Year one, originated, current fiscal year | 279 | 662 |
Year two, originated, fiscal year before current fiscal year | 520 | 321 |
Year three, originated, two years before current fiscal year | 283 | 209 |
Year four, originated, three years before current fiscal year | 155 | 158 |
Year five, originated, four years before current fiscal year | 131 | 37 |
Originated, more than five years before current fiscal year | 136 | 173 |
Revolving loans | 1,194 | 774 |
Total | 2,698 | 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 |