Fair Value of Financial Instruments (Schedule of Pre-tax Gain (Loss) Recognized as a Component of Other Comprehensive Income) (Details) (Cash Flow Hedging [Member], Interest Rate Swap [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
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 2	$ (8)	$ (20)	$ (4)