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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Expected restructuring and related cost $ 3,700    
Estimate of cumulative pre tax costs that will result in cash outlays 70.00%    
Estimate of cumulative pre tax costs that will be noncash 30.00%    
Total pretax restructuring costs $ 97 $ 127  
Cumulative costs since program inception $ 3,400    
Forecast      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring and related cost     $ 400