Financial Derivatives (Derivatives Designated in GAAP Hedge Relationships - Net Investment Hedges) (Details) (Net Investment Hedging [Member], Foreign Exchange Contract [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net	$ (18)	$ (18)