Financial Instruments (Pre-Tax Effect of Foreign Exchange Contracts Designated as Net Investment Hedging Instruments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Reclassified from Other Comprehensive Earnings/(Losses) into Earnings	$ (63)	$ 4	$ (158)	$ (8)
Foreign Exchange Contract [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(199)	(70)	(163)	(30)
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Reclassified from Other Comprehensive Earnings/(Losses) into Earnings	(63)	4	(158)	(8)
Translation Adjustment For Cash Flow And Net Investment Hedge Increase Decrease	(34)	(7)	(19)	(7)
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Translation Adjustment For Cash Flow And Net Investment Hedge Increase Decrease	(44)	(11)	(28)	(11)
Foreign Exchange Contract [Member] | Interest expense, net [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Reclassified from Other Comprehensive Earnings/(Losses) into Earnings	$ 0	$ 0	$ 0	$ 0