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Restructuring - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]          
Expected restructuring and related cost $ 4,000   $ 4,000    
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 199 $ 175 $ 532 $ 559  
Cumulative costs since program inception $ 3,900   $ 3,900    
Forecast          
Restructuring Cost and Reserve [Line Items]          
Expected restructuring and related cost         $ 650