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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
position
Jun. 30, 2017
USD ($)
position
Jun. 30, 2018
USD ($)
position
Jun. 30, 2017
USD ($)
position
Restructuring and Related Activities [Abstract]        
Total pretax restructuring costs $ 235 $ 210 $ 339 $ 425
Cumulative restructuring costs incurred to date since program inception $ 13,800   $ 13,800  
Positions eliminated since inception of program (in positions) | position 44,695   44,695  
Estimated remaining costs related to restructuring program activities $ 500   $ 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 635 475 1,345 1,020