Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying amounts and estimated fair values of the Company's financial instruments
Senior notes, Carrying Amount	$ 2,938	$ 1,794
Senior notes, Estimated Fair Value	2,940	1,810
Senior subordinated notes, Carrying Amount	498	1,645
Senior subordinated notes, Estimated Fair Value	513	1,691
CODES, Carrying Amount	689	698
CODES, Estimated Fair Value	658	701
Carrying Amount [Member]
Carrying amounts and estimated fair values of the Company's financial instruments
Foreign currency forward contracts	1	17
Estimated Fair Value [Member]
Carrying amounts and estimated fair values of the Company's financial instruments
Foreign currency forward contracts	$ 1	$ 17

Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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