Derivatives and Hedging Activities Derivatives and Hedging Activities (Schedule of Interest Rate Derivative Activity (Details) (Interest Rate Swap [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of derivative instrument, undesignated	$ 0	$ 0	$ 0	$ 0
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of derivative instrument, issued	175	0	175	0
Notional amount of derivative instrument, terminated	$ 0	$ 0	$ 0	$ 0