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Risk Management Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivatives designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	$ 1,103	$ 987
Derivative Liability, Fair Value, Net	(90)	(74)
Derivatives not designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	1,172	1,024
Derivative Liability, Fair Value, Net	(100)	(108)
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	316	603
Derivative Liability, Fair Value, Net	(56)	(13)
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	177	359
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	(38)	(13)
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	139	244
Natural gas and crude derivative contracts | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	(18)	0
Natural gas and crude derivative contracts | Derivatives not designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	7	35
Derivative Liability, Fair Value, Net	(10)	(1)
Natural gas and crude derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	7	35
Natural gas and crude derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	(10)	(1)
Interest rate swap agreements | Derivatives designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	774	384
Derivative Liability, Fair Value, Net	0	(9)
Interest rate swap agreements | Derivatives not designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	62	1
Derivative Liability, Fair Value, Net	0	(16)
Interest rate swap agreements | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	12	1
Interest rate swap agreements | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	0	(11)
Interest rate swap agreements | Derivatives not designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	50	0
Interest rate swap agreements | Derivatives not designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	0	(5)
Cross-currency swap agreements | Derivatives designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	13	0
Derivative Liability, Fair Value, Net	(34)	(52)
Power derivative contracts | Derivatives not designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	0	1
Derivative Liability, Fair Value, Net	0	(17)
Power derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	0	1
Power derivative contracts | Derivatives not designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	0	(17)
Commodity Contract [Member] | Derivatives not designated as hedging contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	69	37
Derivative Liability, Fair Value, Net	(10)	(34)
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	117	111
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	0	0
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	657	273
Fair Value Hedging [Member] | Interest rate swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	0	(9)
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	0	0
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Fair value of derivative contracts/(Other current liabilities)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	(22)	(6)
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Net	13	0
Fair Value Hedging [Member] | Cross-currency swap agreements | Derivatives designated as hedging contracts | Deferred charges and other assets/(Other long-term liabilities and deferred credits)
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Net	$ (12)	$ (46)

X

- Definition

Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

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No definition available.

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