Gains Losses Recognized in Accumulated Other Comprehensive Income AOCI Net of Tax Related to Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 6	$ 10
Cash Flow Hedging | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	7	10
Cash Flow Hedging | Fuel oil contracts | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	0	2
Cash Flow Hedging | Natural gas contracts | Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (1)	$ (2)