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Restructuring and Separation Costs - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs $ 8 $ 5 $ 8 $ 25 $ 73 $ 118 $ 43 $ 0 $ 46 $ 234 $ 0  
2017 Restructuring Plan                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 37 234   $ 271
Other | IT Restructuring                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 9      
Restructuring costs expected $ 11               11     11
Other | 2017 Restructuring Plan                        
Restructuring Cost and Reserve [Line Items]                        
Restructuring and separation costs                 $ 26 $ 161   $ 187