Fair Value (Fair Value Measurements Using Significant Unobservable Inputs ( Level 3)) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Millions	9 Months Ended				9 Months Ended
	Sep. 30, 2011 Bifurcated Conversion Feature [Member]		Sep. 30, 2011 Securities Available-For-Sale [Member]	Dec. 31, 2010 Securities Available-For-Sale [Member]	Sep. 30, 2011 Call Options [Member]
Assets, beginning balance			$ 6	$ 6	$ 162
Assets, change in fair value					10
Assets, ending balance			6	6	16
Liabilities, beginning balance	(162)
Convertible Notes activity	156	[1]			(156)	[1]
Liabilities, change in fair value	(10)
Liabilities, ending balance	$ (16)

[1] Represents the change in value resulting from the Company's repurchase of a portion of its Convertible Notes and the settlement of a corresponding portion of the Call Options (see Note 7—Long-Term Debt and Borrowing Arrangements).