Impact of Derivative Instruments in Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Derivative [Line Items]
Derivative Assets	$ 7		$ 6
Derivative Liabilities	33		68
Designated as Hedging Instrument
Derivative [Line Items]
Derivative Assets	5		0
Derivative Liabilities	30		63
Nondesignated
Derivative [Line Items]
Derivative Assets	2		6
Derivative Liabilities	3		5
Nondesignated | Foreign Exchange Contract
Derivative [Line Items]
Derivative Assets	0		1	[1]
Derivative Liabilities	1	[2]	0
Nondesignated | Embedded Derivative
Derivative [Line Items]
Embedded derivative assets	2	[1]	5	[3]
Embedded derivative liabilities	0		0
Nondesignated | Interest Rate Contract
Derivative [Line Items]
Derivative Assets	0		0
Derivative Liabilities	2	[2]	5	[4]
Cash Flow Hedging | Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative Assets	5	[5]	0
Derivative Liabilities	30	[6]	53	[7]
Cash Flow Hedging | Designated as Hedging Instrument | Natural gas contracts
Derivative [Line Items]
Derivative Assets	0		0
Derivative Liabilities	$ 0		$ 10	[2]

[1] Included in Other current assets in the accompanying consolidated balance sheet.

[2] Included in Other accrued liabilities in the accompanying consolidated balance sheet.

[3] Included in Deferred charges and other assets in the accompanying consolidated balance sheet.

[4] Included in Other liabilities in the accompanying consolidated balance sheet.

[5] Includes $3 million in Other current assets and $2 million in Deferred charges and other assets in the accompanying consolidated balance sheet.

[6] Includes $25 million recorded in Other accrued liabilities and $5 million recorded in Other liabilities in the accompanying consolidated balance sheet.

[7] Includes $32 million recorded in Other accrued liabilities and $21 million recorded in Other liabilities in the accompanying consolidated balance sheet.