Derivative Instruments and Hedging Activities - Fair Values of Derivative Instruments Recorded in Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Foreign currency derivatives	$ 12	$ 2
Derivative assets designated as hedging instruments	12	2
Electricity commodity derivatives	4	3
Foreign currency derivatives	1
Interest rate derivatives		28
Derivative liabilities designated as hedging instruments	5	31
Long-term other assets [Member] | Foreign currency derivatives[Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Foreign currency derivatives	12	2
Current accrued liabilities [Member] | Foreign currency derivatives[Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Foreign currency derivatives	1
Current accrued liabilities [Member] | Electricity commodity derivatives [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Electricity commodity derivatives	4	3
Current accrued liabilities [Member] | Interest Rate Swaps [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Interest rate derivatives		$ 28