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Fair Value of Financial Instruments Financial Assets and Liabilities Recognized at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Cash equivalents | $ 82 |  | $ 112
Debt securities: |  |  |
Domestic government | 22 |  | 25
Corporate credit | 12 |  | 10
Money market funds measured at NAV (2) | 12 |  | 7
Non-qualified benefit plan trust: (2) |  |  |
Money market funds | 2 |  | 2
Eqauity securities - domestic | 6 |  | 6
Debt securities—domestic government | 1 |  | 1
Assets from price risk management activities: (1) (3) |  |  |
Electricity | 18 |  | 12
Natural gas | 19 |  | 8
Total | 12 |  | 7
Assets, Fair Value Disclosure | 174 |  | 183
Liabilities from price risk management activities: (1) (3) |  |  |
Derivative Liability |  | $ 5 | 4
Electricity | 75 |  | 94
Natural gas | 35 |  | 58
Total | 110 |  | 156
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets: |  |  |
Cash equivalents | 82 |  | 112
Debt securities: |  |  |
Domestic government | 8 |  | 7
Corporate credit | 0 |  | 0
Non-qualified benefit plan trust: (2) |  |  |
Money market funds | 2 |  | 2
Eqauity securities - domestic | 6 |  | 6
Debt securities—domestic government | 1 |  | 1
Assets from price risk management activities: (1) (3) |  |  |
Electricity | 0 |  | 0
Natural gas | 0 |  | 0
Total | 99 |  | 128
Liabilities from price risk management activities: (1) (3) |  |  |
Derivative Liability |  |  | 0
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 | 14 |  | 18
Corporate credit | 12 |  | 10
Non-qualified benefit plan trust: (2) |  |  |
Money market funds | 0 |  | 0
Eqauity securities - domestic | 0 |  | 0
Debt securities—domestic government | 0 |  | 0
Assets from price risk management activities: (1) (3) |  |  |
Electricity | 14 |  | 9
Natural gas | 19 |  | 8
Total | 59 |  | 45
Liabilities from price risk management activities: (1) (3) |  |  |
Derivative Liability |  |  | 4
Electricity | 6 |  | 10
Natural gas | 30 |  | 51
Total | 36 |  | 65
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
Eqauity securities - domestic | 0 |  | 0
Debt securities—domestic government | 0 |  | 0
Assets from price risk management activities: (1) (3) |  |  |
Electricity | 4 |  | 3
Natural gas | 0 |  | 0
Total | 4 |  | 3
Liabilities from price risk management activities: (1) (3) |  |  |
Derivative Liability |  |  | 0
Electricity | 69 |  | 84
Natural gas | 5 |  | 7
Total | $ 74 |  | $ 91

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