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Fair Value of Financial Instruments Financial Assets and Liabilities Recognized at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Cash equivalents | $ 173 | $ 0
Debt securities: |  |
Domestic government | 16 | 18
Corporate credit | 7 | 7
Money market funds measured at NAV (2) | 7 | 6
Non-qualified benefit plan trust: (2) |  |
Money market funds | 2 | 2
Debt securities—domestic government | 3 | 3
Assets from price risk management activities: (1) (3) |  |
Electricity | 26 | 22
Natural gas | 11 | 11
Total | 10 | 9
Assets, Fair Value Disclosure | 248 | 72
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 61 | 73
Natural gas | 132 | 166
Total | 193 | 239
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Cash equivalents | 173 | 0
Debt securities: |  |
Domestic government | 8 | 9
Corporate credit | 0 | 0
Non-qualified benefit plan trust: (2) |  |
Money market funds | 2 | 2
Debt securities—domestic government | 3 | 3
Assets from price risk management activities: (1) (3) |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Total | 186 | 14
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 | 8 | 9
Corporate credit | 7 | 7
Non-qualified benefit plan trust: (2) |  |
Money market funds | 0 | 0
Debt securities—domestic government | 0 | 0
Assets from price risk management activities: (1) (3) |  |
Electricity | 20 | 8
Natural gas | 11 | 11
Total | 46 | 35
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 28 | 30
Natural gas | 116 | 150
Total | 144 | 180
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
Debt securities—domestic government | 0 | 0
Assets from price risk management activities: (1) (3) |  |
Electricity | 6 | 14
Natural gas | 0 | 0
Total | 6 | 14
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 33 | 43
Natural gas | 16 | 16
Total | $ 49 | $ 59

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- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to purchases or sales of electricity. + References No definition available. + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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