Derivatives and Hedging Interest Rate Management Risk Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months	$ 3		$ 3
Amount of Gain (Loss) Recognized in Income on Derivative	(6)	1	(19)	(8)
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ (11)	$ 3	$ (13)	$ (15)
Cash Flow Hedging [Member]
Derivative [Line Items]
Interest rate fluctuations, maximum hedging period			2 years