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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]        
Total pretax restructuring costs $ 390   $ 1,274  
Restructuring Program, 2025        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring and related cost 3,000   $ 3,000  
Estimate of cumulative pre tax costs that will be cash     60.00%  
Total pretax restructuring costs 302   $ 951  
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 88 $ 279 $ 323 $ 701
Cumulative costs since program inception $ 1,400   $ 1,400