Derivative Instruments and Hedging Strategies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		9 Months Ended	3 Months Ended
	Dec. 31, 2013	Sep. 30, 2014 Foreign Exchange Contract [Member]	Dec. 31, 2013 Foreign Exchange Contract [Member]	Sep. 30, 2014 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2013 Interest Rate Swap [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Senior Unsecured Notes 3.375% due 2024 [Member]	Sep. 30, 2014 Other Noncurrent Liabilities [Member] Interest Rate Swap [Member]	Sep. 30, 2014 Long-term Debt [Member] Interest Rate Swap [Member]
Notional Amount		$ 3,374	$ 2,344	$ 219	$ 344	$ 500
Foreign currency transaction losses								6	(6)
Maximum Term (Days)	546 days	546 days	546 days
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				2	12
Senior Unsecured Notes							$ 600