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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
position
Sep. 30, 2017
USD ($)
position
Sep. 30, 2018
USD ($)
position
Sep. 30, 2017
USD ($)
position
Dec. 31, 2018
USD ($)
Restructuring and Related Activities [Abstract]          
Total pretax restructuring costs $ 169 $ 180 $ 508 $ 605  
Cumulative restructuring costs incurred to date since program inception $ 14,000   $ 14,000    
Positions eliminated since inception of program (in positions) | position 45,220   45,220    
Percentage estimate of cumulative pretax costs that will result in cash outlays (primarily from employee separation expense) (as percent)     66.67%    
Percentage estimate of cumulative pretax costs that will be non-cash (primarily from accelerated depreciation of facilities) (as percent)     33.33%    
Number of positions eliminated | position 525 205 1,870 1,225  
Forecast          
Restructuring Cost and Reserve [Line Items]          
Estimated costs related to restructuring program activities         $ 50