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Financial Instruments (Details 3) (Level 2, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative Assets
Gross Fair Value	$ 164	$ 235
Impact of Netting	(20)	(39)
Derivative Liabilities
Gross Fair Value	(55)	(70)
Impact of Netting	20	39
Current
Derivative Assets
Derivatives	47	108
Derivative Liabilities
Derivatives	(35)	(17)
Non-current
Derivative Assets
Derivatives	97	88
Derivative Liabilities
Derivatives		(14)
Oil and natural gas derivative
Derivative Assets
Gross Fair Value	157	231
Derivative Liabilities
Gross Fair Value	(52)	(64)
Interest rate derivative
Derivative Assets
Gross Fair Value	7	4
Derivative Liabilities
Gross Fair Value	$ (3)	$ (6)

Fair value of 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, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of 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, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details