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Fair Value of FInancial Instruments Schedule of Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | $ 0 | $ 150
Domestic government, Debt securities | 18 | 19
Corporate debt securities held in decommissioning trust assets | 7 | 9
Money market funds | 6 | 11
Fair Value - Money market funds | 2 | 1
Domestic Equity Securities | 0 | 3
Debt securities - domestic government | 3 | 3
Electricity | 22 | 156
Natural gas | 11 | 231
Financial Instruments, Owned, at Fair Value | 9 | 11
Assets, Fair Value Disclosure | 72 | 583
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 73 | 146
Natural gas | 166 | 47
Liabilities, Fair Value Disclosure | 239 | 193
Portion at Other than Fair Value Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 3 |
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 150
Domestic government, Debt securities | 9 | 9
Corporate debt securities held in decommissioning trust assets | 0 | 0
Fair Value - Money market funds | 2 | 1
Domestic Equity Securities | 0 | 3
Debt securities - domestic government | 3 | 3
Electricity | 0 | 0
Natural gas | 0 | 0
Financial Instruments, Owned, at Fair Value | 14 | 166
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Domestic government, Debt securities | 9 | 10
Corporate debt securities held in decommissioning trust assets | 7 | 9
Fair Value - Money market funds | 0 | 0
Domestic Equity Securities | 0 | 0
Debt securities - domestic government | 0 | 0
Electricity | 8 | 93
Natural gas | 11 | 225
Financial Instruments, Owned, at Fair Value | 35 | 337
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 30 | 53
Natural gas | 150 | 39
Liabilities, Fair Value Disclosure | 180 | 92
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Domestic government, Debt securities | 0 | 0
Corporate debt securities held in decommissioning trust assets | 0 | 0
Money market funds | 0 |
Fair Value - Money market funds |  | 0
Domestic Equity Securities | 0 | 0
Debt securities - domestic government | 0 | 0
Electricity | 14 | 63
Natural gas | 0 | 6
Financial Instruments, Owned, at Fair Value | 14 | 69
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 43 | 93
Natural gas | 16 | 8
Liabilities, Fair Value Disclosure | 59 | 101
Non Qualified Benefit Plans [Member] |  |
Liabilities from price risk management activities: [Abstract] |  |
Insurance contracts, at cash surrender value | $ 30 | $ 31

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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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