Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2012	Dec. 31, 2012
Hedging Activities [Abstract]
Fixed rate long-term debt to floating rate debt exchange, fair value hedge	$ 550
Maximum duration to hedge foreign currency risk		18 months
Net losses expected to be reclassified into earnings within the next 12 months		$ 54