Supplemental Cash Flow Disclosures - NPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Cash Flow Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	$ 2,071	$ 2,041	$ 1,855
Income taxes (received) paid, net	(1,863)	(1,309)	(1,361)
Accruals related to property, plant and equipment additions	1,049	834	801
NPC
Condensed Cash Flow Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	121	115	115
Income taxes (received) paid, net	(29)	63	50
Accruals related to property, plant and equipment additions	$ 98	$ 53	$ 32