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Restructuring - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]          
Cumulative costs since program inception $ 2,300   $ 2,300    
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%    
Expected restructuring and related cost 3,000   $ 3,000    
Total pretax restructuring costs $ 128 $ 149 $ 462 $ 315  
Forecast          
Restructuring Cost and Reserve [Line Items]          
Expected restructuring and related cost         $ 700