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Share-Based Compensation Expense (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-Based Compensation Expense [Abstract] |  |  |  |
Granted (in shares) |  | 586 | 395 | 421
Compensation cost for share-based awards | [1] | $ 27 | $ 36 | $ 31
Tax benefit recognized in income |  | 7 | 9 | $ 8
Unrecognized compensation cost related to nonvested share-based compensation awards |  | $ 38 | $ 37 |
Weighted-average period for recognition of unrecognized compensation cost related to nonvested share-based compensation awards (in years) |  | 1 year 8 months 12 days |  |
Compensation Related Costs [Abstract] |  |  |  |
Compensation costs for share-based payments included in O&M |  | $ 25 |  |
Service-based awards [Member] |  |  |  |
Share-Based Compensation Expense [Abstract] |  |  |  |
Granted (in shares) |  | 400 | 200 | 200
[1] | Compensation costs for share-based payments are included in O&M expense. Amount for equity awards (non-cash) was $25 million in 2023.

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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