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Fair Value of Financial Assets and Liabilities - Nonrecurring (Details) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,574 $ 1,464
Business Combination, Contingent Consideration, Liability 0 4
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,455 1,449
Business Combination, Contingent Consideration, Liability $ 0 $ 4