Severance (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) employee	Dec. 31, 2023 USD ($) employee	Dec. 31, 2022 USD ($) employee
Restructuring and Related Activities [Abstract]
Number of eligible employees | employee	341	682	233
Severance expense | $	$ (28)	$ 102	$ 65
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Operation, maintenance and other