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Long-Term Debt And Borrowing Arrangements (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Uncommitted Credit Facility [Member] Minimum [Member]	Mar. 31, 2013 Uncommitted Credit Facility [Member] Maximum [Member]	Mar. 31, 2013 Floating Rate Term Loan Due March Two Thousand Nineteen [Member]	Mar. 31, 2013 Subsequent Event [Member]	Apr. 30, 2013 Subsequent Event [Member] Five And One Over Two Senior Notes [Member]	Oct. 31, 2012 Subsequent Event [Member] Five And One Over Two Senior Notes [Member]
Debt Instrument [Line Items]
Proceeds from issue of senior notes	$ 250
Increase in borrowing through the term loan				200
Convertible senior note principal amount	51
Convertible notes purchase price	89
Tender Offer To Purchase Senior Notes					450
Debt Instrument Offering Value						$ 500	$ 500
Credit facilities bearing interest		0.42%	8.22%

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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- Definition

The cash outflow from the repayment of a long-term debt instrument which 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.

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