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Financial Risk Management and Trading Activities - Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Total net derivative contract assets	$ 328	$ 931
Total net derivative contract liabilities	258	929
Discontinued Operations [Member]
Derivative [Line Items]
Total net derivative contract assets	1	612
Total net derivative contract liabilities	$ 4	$ 620

Fair value, after the 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 not elected to be offset.

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- Definition

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+ Details