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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value Disclosures [Abstract]          
Reduction of contingent consideration   $ 110      
Gain on sale of marketable securities $ 15   $ 26 $ 40 $ 61