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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Schedule II
Valuation and Qualifying Accounts
(In millions)
 
Additions
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses
Charged to Other Accounts(1)
Deductions Balance at
End of
Period
Valuation account for accounts receivable:
Year ended December 31, 2020$2 $(1)$— $— $1 
Year ended December 31, 20193 — — 1 2 
Year ended December 31, 20183 1 — 1 3 
Valuation account for deferred tax assets:
Year ended December 31, 2020$421 $1 $3 $12 $413 
Year ended December 31, 201956 6 375 16 421 
Year ended December 31, 2018134 — — 78 56 

(1)The amount in 2020 primarily included increases to our valuation allowance related to business combination purchase price allocation adjustments. The amount in 2019 related to Luxembourg reorganization activities, which resulted in the realization of deferred tax liabilities related to depreciation and amortization and a corresponding increase in valuation allowances, with no net impact to our provision for income taxes. See Note 16, Income Taxes in the Notes to Consolidated Financial Statements for further information.
See accompanying report of independent registered public accounting firm.