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Risk Management (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 31, 2019 | Dec. 31, 2018
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 | 30 | $ (9) | (19) | $ 6 |  |
Derivative, Net Liability Position, Aggregate Fair Value | 109 |  | 109 |  |  |
Collateral Already Posted, Aggregate Fair Value | 21 |  | 21 |  |  |
Collateral cash requirement | 103 |  | 103 |  |  |
Deposit Assets | 0 |  | 0 |  |  |
Derivative Liability |  |  |  |  | $ 5 | 4
Natural Gas [Member] |  |  |  |  |  |
Derivative Instruments and Hedges, Liabilities | 4 |  | 4 |  |  | 4
4911 Electric Services [Member] |  |  |  |  |  |
Derivative Instruments and Hedges, Liabilities | 68 |  | 68 |  |  | 84
Liabilities, Total [Member] |  |  |  |  |  |
Derivative Instruments and Hedges, Liabilities | $ 72 |  | $ 72 |  |  | 88
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Derivative Liability |  |  |  |  |  | $ 4

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- Definition The aggregate fair value of assets that would be required to be posted as collateral for derviative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References No definition available. + 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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