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Restructuring (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 12 $ 88 $ 37
Separation and other headcount-related costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total costs incurred to date 548    
Asset-related charges [Member]      
Restructuring Cost and Reserve [Line Items]      
Total costs incurred to date $ 261