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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
position
Sep. 30, 2016
USD ($)
position
Sep. 30, 2017
USD ($)
position
Sep. 30, 2016
USD ($)
position
Restructuring and Related Activities [Abstract]        
Total pretax restructuring costs $ 180 $ 212 $ 605 $ 759
Cumulative restructuring costs incurred to date since program inception $ 13,200   $ 13,200  
Positions eliminated since inception of program (in positions) | position 42,120   42,120  
Estimated remaining costs related to restructuring program activities $ 250   $ 250  
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 205 300 1,225 1,355