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Risk Management Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | $ 450 | $ 471
Liability derivatives | (148) | (169)
Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 79 | 171
Liability derivatives | (77) | (81)
Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 65 | 101
Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (53) | (57)
Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Deferred Charges and Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 14 | 70
Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Other Long-Term Liabilities and Deferred Credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (24) | (24)
Designated as Hedging Instrument [Member] | Interest rate swap agreements |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 205 | 300
Liability derivatives | (65) | (57)
Designated as Hedging Instrument [Member] | Interest rate swap agreements | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 41 | 94
Designated as Hedging Instrument [Member] | Interest rate swap agreements | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (3) | 0
Designated as Hedging Instrument [Member] | Interest rate swap agreements | Deferred Charges and Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 164 | 206
Designated as Hedging Instrument [Member] | Interest rate swap agreements | Other Long-Term Liabilities and Deferred Credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (62) | (57)
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 166 | 0
Liability derivatives | (6) | (31)
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 0 | 0
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (6) | (7)
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Deferred Charges and Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 166 | 0
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Other Long-Term Liabilities and Deferred Credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | (24)
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 458 | 474
Liability derivatives | (172) | (199)
Not Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 8 | 3
Not Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (22) | (29)
Not Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Deferred Charges and Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 0 | 0
Not Designated as Hedging Instrument [Member] | Energy commodity derivative contracts(a) | Other Long-Term Liabilities and Deferred Credits [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (2) | (1)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 8 | 3
Liability derivatives | $ (24) | $ (30)

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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=82849420&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=82849420&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=84234895&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=84234895&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=82849420&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=82849420&loc=SL20226008-175313 + Details
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