Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income Balances, Net of Related Tax Effects (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency translation, Beginning balance	$ 133		$ 161		$ 155
Foreign currency translation, Period change	30		(28)		6
Foreign currency translation, Ending balance	163		133		161
Unrealized gains (losses) on hedging instruments, Beginning balance			10		5
Unrealized gains (losses) on hedging instruments, Period change	3	[1]	(10)	[1]	5	[1]
Unrealized gains (losses) on hedging instruments, Ending balance	3				10
Unrecognized losses and prior service cost, net, Beginning balance	(587)		(427)		(326)
Unrecognized losses and prior service cost, net, Period change	(133)		(160)		(101)
Unrecognized losses and prior service cost, net, Ending balance	(720)		(587)		(427)
Total accumulated other comprehensive loss, Beginning balance	(454)		(256)		(166)
Total accumulated other comprehensive loss, Period change	(100)		(198)		(90)
Total accumulated other comprehensive loss, Ending balance	$ (554)		$ (454)		$ (256)

[1] Net of income taxes of $2 million in 2012, income tax benefits of $7 million in 2011, and income taxes of $4 million in 2010