Financial Instruments (Fair Value of Foreign Exchange Contracts) (Details) (Foreign Exchange Contract [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 13,500,000,000
Derivative asset fair value	101,000,000	153,000,000
Derivative liability fair value	92,000,000	116,000,000
Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset fair value	74,000,000	111,000,000
Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability fair value	5,000,000	44,000,000
Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset fair value	1,000,000	0
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability fair value	45,000,000	46,000,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	10,100,000,000
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset fair value	26,000,000	42,000,000
Not Designated as Hedging Instrument [Member] | Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability fair value	42,000,000	12,000,000
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability fair value	0	14,000,000
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,100,000,000
Net Investment Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,300,000,000