XML 67 R32.htm IDEA: XBRL DOCUMENT v3.22.0.1
SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts for the years ended December 31, 2021, 2020 and 2019:
(in millions) Additions  
DescriptionBalance at
Beginning of
Period		Charged to
Costs and
Expenses		Charged to
Other
Accounts		DeductionsBalance at
End of
Period
Allowance for doubtful accounts (a)
Year ended December 31, 2021
$13 $2 $— $(4)$11 
Year ended December 31, 2020
11 9 — (7)13 
Year ended December 31, 2019
9 5 — (3)11 
Deferred tax asset valuation allowance
Year ended December 31, 2021
$21 $(1)$— $— $20 
Year ended December 31, 2020
17 4 — — 21 
Year ended December 31, 2019
18 (1)— — 17 
_______________
(a)The deduction column represents uncollectible accounts written off, net of recoveries from Trade Receivables, in the Consolidated Balance Sheets.