Supplemental Cash Flow Disclosures - SPPC (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
SPPC
Condensed Cash Flow Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	45	41	42
Income taxes (received) paid, net	(1)	(3)	2
Accruals related to property, plant and equipment additions	$ 57	$ 27	$ 17