Financial Risk Management Activities - Gross and Net Fair Values (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Accounts Receivable
Derivatives Fair Value [Line Items]
ASSETS – Gross fair value of derivative contracts	$ 43	$ 22
ASSETS – Master netting arrangements	0	(3)
ASSETS – Net fair value of Derivative Contracts	43	19
Accounts Receivable \| Designated As Hedging Instrument
Derivatives Fair Value [Line Items]
ASSETS – Gross fair value of derivative contracts	20	3
Accounts Receivable \| Designated As Hedging Instrument \| Interest Rate Contract
Derivatives Fair Value [Line Items]
ASSETS – Gross fair value of derivative contracts	20	3
Accounts Receivable \| Derivative Contracts Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
ASSETS – Gross fair value of derivative contracts	23	19
Accounts Receivable \| Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange
Derivatives Fair Value [Line Items]
ASSETS – Gross fair value of derivative contracts	23	19
Accounts Payable
Derivatives Fair Value [Line Items]
LIABILITIES – Gross fair value of derivative contracts	0	(3)
LIABILITIES – Master netting arrangements	0	3
LIABILITIES – Net fair value of Derivative Contracts	0	0
Accounts Payable \| Designated As Hedging Instrument
Derivatives Fair Value [Line Items]
LIABILITIES – Gross fair value of derivative contracts	0	0
Accounts Payable \| Designated As Hedging Instrument \| Interest Rate Contract
Derivatives Fair Value [Line Items]
LIABILITIES – Gross fair value of derivative contracts	0	0
Accounts Payable \| Derivative Contracts Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
LIABILITIES – Gross fair value of derivative contracts	0	(3)
Accounts Payable \| Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange
Derivatives Fair Value [Line Items]
LIABILITIES – Gross fair value of derivative contracts	$ 0	$ (3)

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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