Derivative Instruments and Hedging Strategies (Forward Currency Exchange Contracts) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Maximum Term (Days)		546 days
Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional Amount	$ 3,374	$ 2,344
Maximum Term (Days)	546 days	546 days
Derivative, Fair Value, Net	(2)	23
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional Amount	219	344
Derivative, Fair Value, Net	6	11
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional Amount	3,155	2,000
Derivative, Fair Value, Net	(8)	12
Other Current Assets | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	20	21
Other Current Assets | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	6	11
Other Current Assets | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	14	10
Other Noncurrent Assets [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	4
Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	1
Other Noncurrent Assets [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	3
Other Current Liabilities | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	23	2
Other Current Liabilities | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	1	1
Other Current Liabilities | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 22	$ 1