Financial Derivatives (Gains (Losses) on Derivatives - 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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net	$ 51	$ (55)	$ 18	$ 1