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Allowance for Credit Losses – Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Summary of Allowance for Credit Losses on Accounts Receivables

Activity in the allowance for credit losses on accounts receivable is summarized as follows:

 

 

Year Ended December 31,

 

 

(in millions)

2021

 

 

2020

 

 

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