Debt (Gain Or Loss On The Hedged Item And Offsetting Gain Or Loss On Interest Rate Swaps) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Operating expenses	$ (716)	$ (728)
Other operating expenses net income effect	0	0
Loss On Swaps [Member]
Other Operating expenses	(1)	(1)
Gain On Notes [Member]
Other Operating expenses	$ 1	$ 1