Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 223	$ 208	$ 690	$ 766
Other comprehensive loss:
Foreign currency translation adjustment	(51)	(54)	(117)	(75)
Comprehensive income	172	154	573	691
Less: Comprehensive income/(loss) attributable to noncontrolling interest	(10)	(12)	(12)	13
Comprehensive income attributable to American Honda Finance Corporation	$ 182	$ 166	$ 585	$ 678