Financial Instruments - Carrying Amounts and Estimated Fair Values of Company's Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Of Other Financial Instrument [Line Items]
Senior Notes, Carrying Amount	$ 2,940	$ 2,938
Senior Subordinated Notes, Carrying Amount		498
CODES, Carrying Amount	689	689
Senior Notes, Estimated Fair Value	3,301	2,940
Senior Subordinated Notes, Estimated Fair Value		513
CODES, Estimated Fair Value	697	658
Estimated Fair Value [Member]
Fair Value Of Other Financial Instrument [Line Items]
Foreign currency forward contracts	5	1
Carrying Amount [Member]
Fair Value Of Other Financial Instrument [Line Items]
Foreign currency forward contracts	$ 5	$ 1

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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