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Summary of Significant Accounting Policies - NPC - 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)
NPC      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 20 18 19
Charged to operating costs and expenses, net 18 14 13
Write-offs, net (18) (12) (14)
Ending balance $ 20 $ 20 $ 18