Other Assets and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013
Other assets:
Notes receivable from alliliates	$ 336	$ 1,172
Used vehicle held for sale	145	139
Deferred charges	110	116
Income taxes receivable	175	0
Derivative assets	49	49
Other assets	478	394
Total other assets	1,293	1,870
Other liabilities:
Unearned insurance premiums and contract revenues	1,756	1,665
Derivative liabilities	22	6
Accounts payable and accrued expenses	823	746
Deferred income	379	332
Other liabilities	148	139
Total other liabilities	3,128	2,888
Non cash activities for used vehicles held for sale	$ 12		$ 32