Goodwill and Other Intangible Assets (Intangible Assets Acquired) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 536	$ 448
Computer Software, Intangible Asset [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 159	$ 136
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years	14 years
Other Intangible Assets [Member]
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets acquired	$ 9	$ 1
Contracts
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 12	$ 196
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	21 years	23 years
Project Development Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 242	$ 67
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	39 years	4 years
Emission allowances [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 23	$ 35
Transmission Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 13
Use Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 91