Goodwill and Other Intangible Assets (Goodwill Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill	$ 3,748	$ 3,750
Accumulated impairment losses	(3,400)	(3,388)
Net balance	348	362	$ 1,177
Goodwill impairment expense	(12)	(777)	$ 0
Goodwill, Written off Related to Sale of Business Unit	(2)
Operating Segments [Member] | Renewables
Goodwill [Roll Forward]
Goodwill	353	355
Accumulated impairment losses	(35)	(35)
Net balance	318	320
Goodwill impairment expense	0
Goodwill, Written off Related to Sale of Business Unit	(2)
Operating Segments [Member] | Utilities
Goodwill [Roll Forward]
Goodwill	2,709	2,709
Accumulated impairment losses	(2,709)	(2,709)
Net balance	0	0
Goodwill impairment expense	0	(133)
Goodwill, Written off Related to Sale of Business Unit	0
Operating Segments [Member] | Energy Infrastructure
Goodwill [Roll Forward]
Goodwill	683	683
Accumulated impairment losses	(656)	(644)
Net balance	27	39
Goodwill impairment expense	12
Goodwill, Written off Related to Sale of Business Unit	0
Operating Segments [Member] | New Energy Technologies
Goodwill [Roll Forward]
Goodwill	3	3
Accumulated impairment losses	0	0
Net balance	3	$ 3
Goodwill impairment expense	0
Goodwill, Written off Related to Sale of Business Unit	$ 0