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Restructuring - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]      
Cumulative costs since program inception $ 1,100    
Estimate of cumulative pre tax costs that will result in cash outlays 60.00%    
Estimate of cumulative pre tax costs that will be noncash 40.00%    
Expected restructuring and related cost $ 2,500    
Total pretax restructuring costs $ 168 $ 187  
Forecast      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring and related cost     $ 800