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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)

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- 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 -SubTopic 20 -Section 55 -Paragraph 9 -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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after offset of derivative asset, 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 and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 4: 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 + Details
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