Derivative Financial Instruments - Fair Values and Location of Company's Derivative Instruments in Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Current Assets [Member]
Derivative [Line Items]
Total derivative instruments, assets	$ 4	$ 4
Other Current Assets [Member] | Foreign currency forward contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, assets	4	3
Other Current Assets [Member] | Foreign currency forward contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, assets		1
Other Current Assets [Member] | CODES due 2035 [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, assets
Other Assets [Member]
Derivative [Line Items]
Total derivative instruments, assets	4	6
Other Assets [Member] | Foreign currency forward contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, assets	4	5
Other Assets [Member] | Foreign currency forward contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, assets		1
Other Assets [Member] | CODES due 2035 [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, assets
Other Current Liabilities [Member]
Derivative [Line Items]
Total derivative instruments, liabilities	2	9
Other Current Liabilities [Member] | Foreign currency forward contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, liabilities	2	8
Other Current Liabilities [Member] | Foreign currency forward contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, liabilities		1
Other Current Liabilities [Member] | CODES due 2035 [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, liabilities
Other Liabilities [Member]
Derivative [Line Items]
Total derivative instruments, liabilities	1
Other Liabilities [Member] | Foreign currency forward contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, liabilities	1
Other Liabilities [Member] | Foreign currency forward contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, liabilities
Other Liabilities [Member] | CODES due 2035 [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative instruments, liabilities