Summary of Significant Accounting Policies - NPC - 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)
NPC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	20	20	18
Charged to operating costs and expenses, net	19	18	14
Write-offs, net	(22)	(18)	(12)
Ending balance	$ 17	$ 20	$ 20