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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]          
Gain on sale of marketable securities $ 30 $ 15 $ 92 $ 40  
Various          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value of contingent consideration $ 395   $ 395   $ 204
Cerus          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value of contingent consideration         $ 192