Investment in Operating Leases - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Operating leases [Abstract]
Estimated early termination losses on operating leases	$ 1	$ 11	$ 30	$ 29
Actual early termination net losses realized on operating leases	14	10	32	26
Provision for credit losses on operating leases	5	5	14	14
Impairment losses on investment in operating leases	$ 0	$ 0	$ 0	$ 0