Other Assets and Other Liabilities - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2015	Mar. 31, 2015
Other Assets And Other Liabilities [Line Items]
Finance receivables, net	$ 1,007	$ 1,184
Investments in operating leases, net	33,741	31,128
TMCC-affiliated companies [Member]
Other Assets And Other Liabilities [Line Items]
Investments in operating leases, net	2	$ 7
TMCC-affiliated companies [Member] | Other Arrangements with Affiliates [Member]
Other Assets And Other Liabilities [Line Items]
Finance receivables, net	1,100
Investments in operating leases, net	1,000
Wholesale [Member] | TMCC-affiliated companies [Member] | Other Arrangements with Affiliates [Member]
Other Assets And Other Liabilities [Line Items]
Finance receivables, net	490
Commercial Finance [Member] | TMCC-affiliated companies [Member] | Other Arrangements with Affiliates [Member]
Other Assets And Other Liabilities [Line Items]
Finance receivables, net	546
Real estate [Member] | TMCC-affiliated companies [Member] | Other Arrangements with Affiliates [Member]
Other Assets And Other Liabilities [Line Items]
Finance receivables, net	53
Working capital [Member] | TMCC-affiliated companies [Member] | Other Arrangements with Affiliates [Member]
Other Assets And Other Liabilities [Line Items]
Finance receivables, net	$ 16