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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
position
Mar. 31, 2017
USD ($)
position
Restructuring and Related Activities [Abstract]    
Total pretax restructuring costs $ 104 $ 215
Cumulative restructuring costs incurred to date since program inception $ 13,600  
Positions eliminated since inception of program (in positions) | position 44,060  
Estimated remaining costs related to restructuring program activities $ 500  
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 710 545