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Restructuring - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Estimate of cumulative pre tax costs that will result in cash outlays 55.00%    
Estimate of cumulative pre tax costs that will be noncash 45.00%    
Total pretax restructuring costs $ 187 $ 104  
Maximum      
Restructuring Cost and Reserve [Line Items]      
Expected remaining restructuring and related cost 800    
Minimum      
Restructuring Cost and Reserve [Line Items]      
Expected remaining restructuring and related cost $ 1,200    
Forecast      
Restructuring Cost and Reserve [Line Items]      
Expected restructuring and related cost     $ 500