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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
Fiserv, Inc.
Schedule II — Valuation and Qualifying Accounts
(In millions)
Additions
DescriptionBalance at Beginning of PeriodCharged to Costs and ExpensesCharged to Other AccountsDeductionsBalance at End of Period
Year ended December 31, 2020
     Deferred tax asset valuation allowance$1,145 6 64 (327)
(2)
$888 
Year ended December 31, 2019
     Deferred tax asset valuation allowance (1)
$101 8 1,036 — $1,145 
Year ended December 31, 2018
     Deferred tax asset valuation allowance$103 1 (3)— $101 
(1)Includes the valuation allowance adjustment associated with the acquisition of First Data.
(2)The decrease in the deferred tax asset valuation allowance is primarily due to a subsidiary restructuring.