Supplemental Cash Flow Disclosures - NPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Cash Flow Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	$ 2,109	$ 2,071	$ 2,041
Income taxes paid (refunded)	(1,370)	(1,863)	(1,309)
Accruals related to property, plant and equipment additions	1,494	1,049	834
NPC
Condensed Cash Flow Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	159	121	115
Income taxes paid (refunded)	(52)	(29)	63
Accruals related to property, plant and equipment additions	$ 230	$ 98	$ 53