Supplemental Financial Information - Summary of Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Decommissioning-related activities:
Regulatory Agreement Units	$ 166	$ 314
Non-Regulatory Agreement Units	83	194
Regulatory Agreement Units	225	29
Non-Regulatory Agreement Units	134	18
Regulatory offset to NDT fund-related activities	(312)	(275)
Total decommissioning-related activities	296	280
Non-service net periodic benefit credit	(2)	14
Net unrealized (losses) gains from equity investments	47	(5)
Other	21	25
Total Other, net	$ 362	$ 314