Debt Extinguishment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Extinguishment of Debt [Line Items]
Debt reductions	$ 611	[1]	$ 0	[1]	$ 1,047	[1]	$ 129	[1]
Pre-tax early debt extinguishment costs	$ 13	[2]	$ 0	[2]	$ 27	[2]	$ 32	[2]

[1] Reductions related to notes with interest rates ranging from 1.625% to 6.95% with original maturities from 2017 to 2023 for the three months ended September 30, 2012, and from 1.625% to 7.95% with original maturities from 2012 to 2023 and from 6.2% to 9.375% with original maturities from 2018 to 2025 for the nine months ended September 30, 2012 and 2011, respectively.

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