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Benefit Plans - Pension Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlement losses and other expenses $ 3 $ 11 $ 3 $ 11
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 10 10 22 22
Interest cost 15 16 30 31
Expected return on plan assets (22) (25) (44) (50)
Net loss from experience differences 9 9 20 17
Prior service cost/(benefit) 0 0 1 1
Settlement losses and other expenses 8 18 15 21
Net periodic benefit costs 20 28 44 42
Pension Plans | Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 37 38 75 77
Interest cost 50 49 102 97
Expected return on plan assets (114) (108) (231) (212)
Net loss from experience differences 42 40 84 81
Prior service cost/(benefit) (1) 0 (1) (1)
Settlement losses and other expenses 0 1 0 2
Net periodic benefit costs $ 14 $ 20 $ 29 $ 44