Other Income, Net Other Income, Net - Additional Information (Details) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended						12 Months Ended		3 Months Ended
	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Official Exchange [Member] USD ($)	Feb. 28, 2013 Official Exchange [Member] VEF	Jan. 31, 2013 Official Exchange [Member] VEF	Sep. 30, 2014 SICAD [Member] VEF	Mar. 31, 2014 SICAD [Member] VEF	Dec. 31, 2014 SICAD2 [Member] USD ($)	Dec. 31, 2014 SICAD2 [Member] VEF	Sep. 30, 2014 Other Income, Net Error [Member] USD ($)
Interest Income, Gross Receipts Tax				$ 3
Foreign Currency Exchange Rate, Remeasurement						6.3	4.3	12.0	10.7
Amount Charged To Expense Due to Inflationary Accounting	3	17	6
Foreign Currency Transaction Gain (Loss), Realized					8					14
Average Transacted Exchange Rate											49.9
Quantifying Misstatement in Current Year Financial Statements, Amount												$ 6