Other Assets and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Other assets:
Notes receivable from alliliates	$ 821	$ 1,172
Used vehicle held for sale	177	139
Deferred charges	111	116
Income taxes receivable	169	0
Derivative assets	53	49
Other assets	491	394
Total other assets	1,822	1,870
Other liabilities:
Unearned insurance premiums and contract revenues	1,791	1,665
Derivative liabilities	26	6
Accounts payable and accrued expenses	951	746
Deferred income	391	332
Other liabilities	124	139
Total other liabilities	3,283	2,888
Non cash activities for used vehicles held for sale	$ 44		$ 71