Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 339	$ 310	$ 875	$ 864
Other comprehensive income:
Foreign currency translation adjustment	58	46	48	(194)
Comprehensive income	397	356	923	670
Less: Comprehensive income/(loss) attributable to noncontrolling interest	35	41	73	(20)
Comprehensive income attributable to American Honda Finance Corporation	$ 362	$ 315	$ 850	$ 690