Other Income, Net - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2014 USD ($) VEF / $	Mar. 31, 2014 USD ($) VEF / $	Dec. 31, 2014 USD ($) VEF / $	Feb. 28, 2013 VEF / $
Amount charged to expense due to inflationary accounting	$ 3	$ 17
Official Exchange [Member]
Foreign Currency Exchange Rate, Remeasurement | VEF / $				6.3
Foreign currency transaction gain (loss), realized			$ 8
SICAD [Member]
Foreign Currency Exchange Rate, Remeasurement | VEF / $	12.0	10.7
SICAD2 [Member]
Foreign currency transaction gain (loss), realized			$ 14
Average transacted exchange rate | VEF / $			49.9
Other Income, Net Error [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 6