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Restructuring - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Total pretax restructuring costs $ 933    
2024 Restructuring Program      
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 $ 190    
2019 Restructuring Program      
Restructuring Cost and Reserve [Line Items]      
Estimate of cumulative pre tax costs that will be noncash 30.00%    
Total pretax restructuring costs $ 743 $ 666 $ 868
Estimate of cumulative pre tax costs that will result in cash outlays 70.00%    
Cumulative costs since inception $ 4,100