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Restructuring - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]        
Expected restructuring and related cost $ 3,500      
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 $ 868 $ 880 $ 915  
Cumulative costs since program inception $ 2,700      
Forecast        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring and related cost       $ 400