Debt Extinguishment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	5.20%		1.625%		5.20%		1.625%
Debt reductions	$ 32	[1]	$ 406	[1]	$ 58	[1]	$ 436	[1]
Pre-tax early debt extinguishment costs	$ 3	[2]	$ 10	[2]	$ 9	[2]	$ 26	[2]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	7.95%		7.95%		7.95%		7.95%
Original maturity date range, minimum	2018		2017		2014		2012
Original maturity date range, maximum	2027		2018		2027		2018

[1] Reductions related to notes with interest rates ranging from 5.20% to 7.95% with original maturities from 2018 to 2027 and from 1.63% to 7.95% with original maturities from 2017 to 2018 for the three months ended June 30, 2013 and 2012, respectively, and 5.20% to 7.95% with original maturities from 2014 to 2027 and from 1.63% to 7.95% with original maturities from 2012 to 2018 for the six months ended June 30, 2013 and June 30, 2012, respectively.

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