Summary of Significant Accounting Policies - SPPC - Schedule of Allowance for Credit Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Charged to operating costs and expenses, net	$ 68	$ 43	$ 81
Write-offs, net	(72)	(45)	(50)
SPPC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	1	2
Charged to operating costs and expenses, net	4	2	2
Write-offs, net	(3)	(1)	(3)
Ending balance	$ 3	$ 2	$ 1