Summary of Significant Accounting Policies - NPC - Schedule of Allowance for Credit Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Charged to operating costs and expenses, net	$ 43	$ 81	$ 56
Write-offs, net	(45)	(50)	(28)
NPC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	18	19	15
Charged to operating costs and expenses, net	14	13	13
Write-offs, net	(12)	(14)	(9)
Ending balance	$ 20	$ 18	$ 19