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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
(In millions)
 
Column AColumn BColumn CColumn DColumn E
DescriptionBalance at
Beginning
of Period		Provision/reversals
Charged
to Costs &
Expenses		Charged
to Other
Accounts		DeductionsBalance
at End of
Period
Allowance for doubtful accounts
Year ended December 31, 2020$18 $(3)$— $— $15 
Year ended December 31, 2019$14 $4 $— $— $18 
Year ended December 31, 2018$12 $2 $— $— $14 
Deferred tax valuation allowance
Year ended December 31, 2020$45 $6 $— $— $51 
Year ended December 31, 2019$39 $6 $— $— $45 
Year ended December 31, 2018$32 $7 $— $— $39