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Risk Management Fair Value of Derivative Contracts (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 285	$ 297
Liability derivatives	(225)	(184)
Designated as Hedging Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	281	293
Liability derivatives	(215)	(179)
Commodity Contract [Member] \| Designated as Hedging Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	10	76
Liability derivatives	(169)	(63)
Commodity Contract [Member] \| Designated as Hedging Contracts [Member] \| Current-Fair value of derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	6	18
Commodity Contract [Member] \| Designated as Hedging Contracts [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(97)	(33)
Commodity Contract [Member] \| Designated as Hedging Contracts [Member] \| Non-current-Fair value of derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	4	58
Commodity Contract [Member] \| Designated as Hedging Contracts [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(72)	(30)
Commodity Contract [Member] \| Not Designated as Hedging Contracts [Member] \| Non-current-Fair value of derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	4	4
Commodity Contract [Member] \| Not Designated as Hedging Contracts [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(10)	(5)
Interest Rate Swap [Member] \| Designated as Hedging Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	271	217
Liability derivatives	(46)	(116)
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Contracts [Member] \| Current-Fair value of derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	79	76
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Contracts [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Contracts [Member] \| Non-current-Fair value of derivative contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	192	141
Fair Value Hedging [Member] \| Interest Rate Swap [Member] \| Designated as Hedging Contracts [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	$ (46)	$ (116)

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