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Restructuring - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
position
Dec. 31, 2016
USD ($)
position
Dec. 31, 2015
USD ($)
position
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 927 $ 1,069 $ 1,110
Cumulative restructuring costs incurred to date since program inception $ 13,500    
Number of positions elimination since inception of program | position 43,350    
Expected 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 2,450 2,625 3,770
Asset abandonment, shut-down and other related costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 267 $ 409 $ 550
Facility Closing      
Restructuring Cost and Reserve [Line Items]      
Pretax losses resulting from sales of facilities and related assets $ 6 $ 151 $ 117