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Restructuring and Impairment Costs - Narrative (Details) - 2024 Restructuring Plan - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Expected restructuring costs     $ 138
Restructuring charges $ 127 $ 138  
Expected cost remaining $ 2 $ 2