Derivative Instruments And Hedging Activities (Summary Of Company's Derivative Instruments) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Derivative assets	$ 27		$ 173
Derivative liabilities	28		183
Designated As Hedging Instruments [Member] | Interest Rate Contract [Member]
Derivative liabilities	13		18
Foreign Exchange Contract [Member] | Not Designated As Hedging Instruments [Member]
Derivative assets	4		4
Derivative liabilities	11		12
Not Designated As Hedging Instruments [Member] | Interest Rate Contract [Member]
Derivative assets	7		7
Derivative liabilities	1		9
Call Option [Member] | Not Designated As Hedging Instruments [Member]
Derivative assets	16	[1]	162	[1]
Bifurcated Conversion Feature [Member] | Not Designated As Hedging Instruments [Member]
Derivative liabilities	$ 16	[1]	$ 162	[1]

[1] See Note 7—Long-Term Debt and Borrowing Arrangements for further detail.