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Risk Management (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | $ 11 | $ 11 |  | $ 11
Net gain or (loss) recognized in the statement of income offset by regulatory accounting | 8 | 2 | $ (65) |
Derivative, Net Liability Position, Aggregate Fair Value | 163 | 163 |  |
Collateral Already Posted, Aggregate Fair Value | 23 | 23 |  |
Collateral cash requirement | 160 | 160 |  |
Deposit Assets | 0 | 0 |  |
Derivative, Notional Amount | 170 | 170 |  |
Natural Gas [Member] |  |  |  |
Derivative Instruments and Hedges, Liabilities | 4 | 4 |  | 6
4911 Electric Services [Member] |  |  |  |
Derivative Instruments and Hedges, Liabilities | 112 | 112 |  | 130
Liabilities, Total [Member] |  |  |  |
Derivative Instruments and Hedges, Liabilities | 116 | 116 |  | $ 136
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Derivative Asset | $ 6 | $ 6 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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