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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis Assets and liabilities measured at fair value on a recurring basis consisted of the following at December 31:
Fair Value
(In millions)ClassificationFair Value Hierarchy20202019
Assets
   Cash flow hedgesPrepaid expenses and other current assetsLevel 2$$
Liabilities
   Contingent considerationAccounts payable and accrued expensesLevel 3$46 $— 
   Contingent considerationOther long-term liabilitiesLevel 3— 
   Contingent debt guaranteeOther long-term liabilitiesLevel 3—