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Restructuring - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
position
Jun. 30, 2016
USD ($)
position
Jun. 30, 2017
USD ($)
position
Jun. 30, 2016
USD ($)
position
Restructuring and Related Activities [Abstract]        
Total pretax restructuring costs $ 210 $ 351 $ 425 $ 547
Cumulative restructuring costs incurred to date since program inception $ 13,000   $ 13,000  
Positions eliminated since inception of program (in positions) | position 41,920   41,920  
Estimated remaining costs related to restructuring program activities $ 300   $ 300  
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 475 585 1,020 1,055