Fair Value Measurements and Derivatives - Additional Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unobservable Input Risk Premium	2.50%
Notional amounts of derivatives	$ 373
Deferred gains (losses) which are reported in AOCI that are expected to be reclassified to earnings during the next twelve months		3
Foreign Exchange Forward [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amounts of derivatives	225	217
Currency Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amounts of derivatives	$ 148