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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts Valuation and Qualifying Accounts
The table below provides changes in the allowance for credit losses over each period:
(in millions)202120202019
Balance at beginning of year$38 $25 $25 
Additions charged to expense2 25 3 
Deductions/other(5)(12)(3)
Balance at end of year$35 $38 $25