Summary of Significant Accounting Policies - SPPC - Schedule of Allowance for Credit Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Charged to operating costs and expenses, net	$ 61	$ 68	$ 43
Write-offs, net	(84)	(72)	(45)
SPPC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	2	1
Charged to operating costs and expenses, net	4	4	2
Write-offs, net	(3)	(3)	(1)
Ending balance	$ 4	$ 3	$ 2