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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs     $ 701  
Restructuring Program, 2024        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring and related cost $ 4,000   4,000  
Estimate of cumulative pre tax costs that will be noncash 60.00%      
Total pretax restructuring costs $ 279   701  
Cumulative costs since program inception $ 892   $ 892  
Restructuring Program, 2019        
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs   $ 199   $ 532