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Fair Value of FInancial Instruments Schedule of Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | $ 255 | $ 26
Domestic government, Debt securities | 20 | 24
Corporate debt securities held in decommissioning trust assets | 13 | 9
Money market funds | 12 | 13
Fair Value - Money market funds | 1 | 1
Domestic Equity Securities | 7 | 7
Debt securities - domestic government | 1 | 1
Electricity | 8 | 16
Natural gas | 37 | 22
Financial Instruments, Owned, at Fair Value | 12 | 13
Assets, Fair Value Disclosure | 354 | 119
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 146 | 119
Natural gas | 5 | 12
Liabilities, Fair Value Disclosure | 151 | 131
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 | 255 | 26
Domestic government, Debt securities | 9 | 8
Corporate debt securities held in decommissioning trust assets | 0 | 0
Fair Value - Money market funds | 1 | 1
Domestic Equity Securities | 7 | 7
Debt securities - domestic government | 1 | 1
Electricity | 0 | 0
Natural gas | 0 | 0
Financial Instruments, Owned, at Fair Value | 273 | 43
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 | 11 | 16
Corporate debt securities held in decommissioning trust assets | 13 | 9
Fair Value - Money market funds | 0 | 0
Domestic Equity Securities | 0 | 0
Debt securities - domestic government | 0 | 0
Electricity | 4 | 9
Natural gas | 36 | 21
Financial Instruments, Owned, at Fair Value | 64 | 55
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 5 | 14
Natural gas | 4 | 12
Liabilities, Fair Value Disclosure | 9 | 26
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 | 4 | 7
Natural gas | 1 | 1
Financial Instruments, Owned, at Fair Value | 5 | 8
Liabilities from price risk management activities: [Abstract] |  |
Electricity | 141 | 105
Natural gas | 1 | 0
Liabilities, Fair Value Disclosure | 142 | 105
Non Qualified Benefit Plans [Member] |  |
Liabilities from price risk management activities: [Abstract] |  |
Insurance contracts, at cash surrender value | $ 33 | $ 29

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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 Carrying amount as of the balance sheet date of the asset arising from commodity contracts related to purchases or sales of natural gas. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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