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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs $ 246  
Restructuring Program, 2024    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring and related cost $ 4,000  
Estimate of cumulative pre tax costs that will be noncash 60.00%  
Total pretax restructuring costs $ 246  
Cumulative costs since program inception $ 436  
Restructuring Program, 2019    
Restructuring Cost and Reserve [Line Items]    
Total pretax restructuring costs   $ 97