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Fair Value of Financial Instruments Financial Assets and Liabilities Recognized at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Cash equivalents | $ 293 | $ 26
Debt securities: |  |
Domestic government | 19 | 24
Corporate credit | 15 | 9
Money market funds measured at NAV (2) | 13 | 13
Non-qualified benefit plan trust: (2) |  |
Money market funds | 1 | 1
Equity securities - domestic | 6 | 7
Debt securities—domestic government | 1 | 1
Assets from price risk management activities: (1) (3) |  |
Electricity | 28 | 16
Natural gas | 28 | 22
Total | 13 | 13
Assets, Fair Value Disclosure | 404 | 119
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 173 | 119
Natural gas | 12 | 12
Total | 185 | 131
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Cash equivalents | 293 | 26
Debt securities: |  |
Domestic government | 7 | 8
Corporate credit | 0 | 0
Non-qualified benefit plan trust: (2) |  |
Money market funds | 1 | 1
Equity securities - domestic | 6 | 7
Debt securities—domestic government | 1 | 1
Assets from price risk management activities: (1) (3) |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Total | 308 | 43
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Total | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Cash equivalents | 0 | 0
Debt securities: |  |
Domestic government | 12 | 16
Corporate credit | 15 | 9
Non-qualified benefit plan trust: (2) |  |
Money market funds | 0 | 0
Equity securities - domestic | 0 | 0
Debt securities—domestic government | 0 | 0
Assets from price risk management activities: (1) (3) |  |
Electricity | 28 | 9
Natural gas | 25 | 21
Total | 80 | 55
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 19 | 14
Natural gas | 12 | 12
Total | 31 | 26
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Cash equivalents | 0 | 0
Debt securities: |  |
Domestic government | 0 | 0
Corporate credit | 0 | 0
Non-qualified benefit plan trust: (2) |  |
Money market funds | 0 | 0
Equity securities - domestic | 0 | 0
Debt securities—domestic government | 0 | 0
Assets from price risk management activities: (1) (3) |  |
Electricity | 0 | 7
Natural gas | 3 | 1
Total | 3 | 8
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 154 | 105
Natural gas | 0 | 0
Total | $ 154 | $ 105

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