Accounting for Derivative Instruments and Hedging Activities (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash Flow Hedge Loss to be Reclassified within Twelve Months	$ 10,000,000
Derivative, Notional Amount	1,400,000,000	2,200,000,000
Delayed start interest rate derivative instruments	150,000,000
Notional amount of currently effective interest rate swaps	$ 1,300,000,000