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Commitments and Contingencies - Expenses and Insurance Recoveries (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 03, 2019
lawsuit
Nov. 30, 2018
lawsuit
Mar. 15, 2019
lawsuit
Sep. 30, 2021
USD ($)
lawsuit
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
lawsuit
Sep. 30, 2020
USD ($)
Data Security Incident              
Loss Contingencies [Line Items]              
Expense related to data security incident | $       $ 4,000,000 $ 35,000,000 $ 16,000,000 $ 17,000,000
Insurance recoveries related to data security incident | $       0 4,000,000 11,000,000 24,000,000
Insurance recoveries received | $       $ 0 $ 1,000,000 $ 10,000,000 $ 45,000,000
Class Action Lawsuits Related to Data Security Incident              
Loss Contingencies [Line Items]              
Number of new lawsuits filed | lawsuit   100          
Claims remaining | lawsuit       1   1  
Shareholder Derivative Complaints Related to Data Security Incident              
Loss Contingencies [Line Items]              
Number of new lawsuits filed | lawsuit 2   2