Significant Accounting Policies 3 (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States		76.00%	69.00%
Restricted cash reclassified from Other noncurrent assets, net to Cash and cash equivalents	$ 50,000,000	$ 4,000,000	$ 0	$ 50,000,000
Advertising expense		35,000,000	39,000,000	38,000,000
Insurance Subsidiary | Minimum Required Balance
Significant Accounting Policies
Restricted cash	$ 250,000			250,000	$ 50,000,000
Other Noncurrent Assets, Net
Significant Accounting Policies
Restricted cash		1,000,000	1,000,000
Other Expenses, Net
Significant Accounting Policies
Foreign currency transaction losses (gains)		26,000,000	(14,000,000)	17,000,000
Other Expenses, Net | Argentina
Significant Accounting Policies
Foreign currency transaction losses (gains)		11,000,000
Other Expenses, Net | Venezuela
Significant Accounting Policies
Foreign currency transaction losses (gains)			14,000,000	6,000,000
Interest Expense, Net
Significant Accounting Policies
Interest income		$ 30,000,000	$ 30,000,000	$ 21,000,000