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Fair Value of Financial Instruments Financial Assets and Liabilities Recognized at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Cash equivalents | $ 0 | $ 150
Debt securities: |  |
Domestic government | 20 | 19
Corporate credit | 11 | 9
Money market funds measured at NAV (2) | 7 | 11
Non-qualified benefit plan trust: (2) |  |
Money market funds | 3 | 1
Equity securities - domestic | 3 | 3
Debt securities—domestic government | 3 | 3
Assets from price risk management activities: (1) (3) |  |
Electricity | 84 | 156
Natural gas | 77 | 231
Total | 7 | 11
Assets, Fair Value Disclosure | 208 | 583
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 113 | 146
Natural gas | 57 | 47
Total | 170 | 193
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Cash equivalents | 0 | 150
Debt securities: |  |
Domestic government | 10 | 9
Corporate credit | 0 | 0
Non-qualified benefit plan trust: (2) |  |
Money market funds | 3 | 1
Equity securities - domestic | 3 | 3
Debt securities—domestic government | 3 | 3
Assets from price risk management activities: (1) (3) |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Total | 19 | 166
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 | 10 | 10
Corporate credit | 11 | 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 | 39 | 93
Natural gas | 71 | 225
Total | 131 | 337
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 41 | 53
Natural gas | 50 | 39
Total | 91 | 92
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 | 45 | 63
Natural gas | 6 | 6
Total | 51 | 69
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 72 | 93
Natural gas | 7 | 8
Total | $ 79 | $ 101

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