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Allowance for Credit Losses - Summary of Allowance for Credit Losses on Accounts Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Receivables [Abstract]    
Balance at beginning of period $ 14 $ 13
Provision for expected credit losses 4 7
Write-offs/recoveries (4) (6)
Balance at end of period $ 14 $ 14