Finance Receivables - Summary of Loans by Risk Rate Grouping (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Current Period
Total	$ 54,876	$ 53,042
Current Period, Gross charge-offs
Total	493	406	$ 293
Prior Year
Total	54,876	53,042
Prior Period, Gross charge-offs
Total	493	406	293
Dealer loans
Current Period
Total	4,703	4,344
Current Period, Gross charge-offs
Total	0	0	0
Prior Year
Total	4,703	4,344
Prior Period, Gross charge-offs
Total	0	0	$ 0
Dealer loans \| Performing Financing Receivable
Current Period
Total	4,703	4,344
Current Period, Gross charge-offs
Total	0	0
Prior Year
Total	4,703	4,344
Prior Period, Gross charge-offs
Total	0	0
Dealer loans \| Group I \| Performing Financing Receivable
Current Period
Total	3,290	2,989
Prior Year
Total	3,290	2,989
Dealer loans \| Group II \| Performing Financing Receivable
Current Period
Total	1,413	1,354
Prior Year
Total	1,413	1,354
Dealer loans \| Group III \| Performing Financing Receivable
Current Period
Total	0	1
Prior Year
Total	0	1
Dealer loans \| Commercial loans \| Performing Financing Receivable
Current Period
2026	52	172
2025	148	166
2024	160	55
2023	52	13
2022	13	92
Prior	151	78
Revolving loans	991	762
Current Period, Gross charge-offs
2026	0	0
2025	0	0
2024	0	0
2023	0	0
2022	0	0
Prior	0	0
Revolving loans	0	0
Prior Year
2025	52	172
2024	148	166
2023	160	55
2022	52	13
2021	13	92
Prior	151	78
Revolving loans	991	762
Prior Period, Gross charge-offs
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans	0	0
Dealer loans \| Commercial loans \| Group I \| Performing Financing Receivable
Current Period
2026	50	149
2025	135	110
2024	104	52
2023	50	13
2022	8	86
Prior	125	53
Revolving loans	965	762
Prior Year
2025	50	149
2024	135	110
2023	104	52
2022	50	13
2021	8	86
Prior	125	53
Revolving loans	965	762
Dealer loans \| Commercial loans \| Group II \| Performing Financing Receivable
Current Period
2026	2	23
2025	13	56
2024	56	3
2023	2	0
2022	5	6
Prior	26	25
Revolving loans	26	0
Prior Year
2025	2	23
2024	13	56
2023	56	3
2022	2	0
2021	5	6
Prior	26	25
Revolving loans	26	0
Dealer loans \| Commercial loans \| Group III \| Performing Financing Receivable
Current Period
2026	0	0
2025	0	0
2024	0	0
2023	0	0
2022	0	0
Prior	0	0
Revolving loans	0	0
Prior Year
2025	0	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
Prior	0	0
Revolving loans	0	0
Dealer loans \| Wholesale flooring \| Performing Financing Receivable
Current Period
Total	3,136	3,006
Current Period, Gross charge-offs
Total	0	0
Prior Year
Total	3,136	3,006
Prior Period, Gross charge-offs
Total	0	0
Dealer loans \| Wholesale flooring \| Group I \| Performing Financing Receivable
Current Period
Total	1,853	1,764
Prior Year
Total	1,853	1,764
Dealer loans \| Wholesale flooring \| Group II \| Performing Financing Receivable
Current Period
Total	1,283	1,241
Prior Year
Total	1,283	1,241
Dealer loans \| Wholesale flooring \| Group III \| Performing Financing Receivable
Current Period
Total	0	1
Prior Year
Total	$ 0	$ 1

AMERICAN HONDA FINANCE CORP 10-K