Debt Extinguishment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Extinguishment of Debt [Line Items]
Debt reductions	$ 406	[1]	$ 0	[1]	$ 436	[1]	$ 129	[1]
Pre-tax early debt extinguishment costs	$ 10	[2]	$ 0	[2]	$ 14	[2]	$ 32	[2]

[1] Reductions related to notes with interest rates ranging from 1.625% to 7.95% with original maturities from 2017 to 2018 for the three months ended June 30, 2012, and from 1.625% to 7.95% with original maturities from 2012 to 2018 and from 6.2% to 9.375% with original maturities from 2018 to 2025 for the six months ended June 30, 2012 and 2011, respectively.

[2] Amounts are included in Restructuring and Other Charges in the accompanying consolidated statements of operations.