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Income Taxes (Summary Of Detail Of Tax Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | $ 40 | $ 53
Operating Loss Carryforwards, Valuation Allowance | (21) |
Deferred Tax Assets, Net of Valuation Allowance | 1,802 | $ 603
Total Net Operating Losses [Member] |  |
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance | 19 |
Net Operating Losses Federal Date Range 1 |  |
Income Tax Contingency [Line Items] |  |
Operating Loss Carryforwards, Valuation Allowance | 0 |
Deferred Tax Assets, Net of Valuation Allowance | 5 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 5 |
Net Operating Losses Federal Date Range 2 |  |
Income Tax Contingency [Line Items] |  |
Operating Loss Carryforwards, Valuation Allowance | 0 |
Deferred Tax Assets, Net of Valuation Allowance | 11 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 11 |
Net Operating Losses States Date Range One [Member] |  |
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 16 |
Operating Loss Carryforwards, Valuation Allowance | (15) |
Deferred Tax Assets, Net of Valuation Allowance | 1 |
Net Operating Losses States Date Range Two [Member] |  |
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 3 |
Operating Loss Carryforwards, Valuation Allowance | (2) |
Deferred Tax Assets, Net of Valuation Allowance | 1 |
Net Operating Losses States Date Range Three [Member] |  |
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 3 |
Operating Loss Carryforwards, Valuation Allowance | (2) |
Deferred Tax Assets, Net of Valuation Allowance | 1 |
Other Credits States Date Range One [Member] |  |
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 2 |
Operating Loss Carryforwards, Valuation Allowance | (2) |
Deferred Tax Assets, Net of Valuation Allowance | $ 0 |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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