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Benefit Plans - Pension Costs (Details) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Simplify to Grow Program        
Defined Benefit Plan Disclosure [Line Items]        
Settlement losses and other expenses $ 5 $ 3 $ 5 $ 3
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 9 10 18 22
Interest cost 15 15 31 30
Expected return on plan assets (22) (22) (44) (44)
Net loss from experience differences 5 9 10 20
Prior service cost/(credit) 1 0 1 1
Settlement losses and other expenses 4 8 8 15
Net periodic benefit costs 12 20 24 44
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 30 37 61 75
Interest cost 51 50 102 102
Expected return on plan assets (101) (114) (204) (231)
Net loss from experience differences 37 42 75 84
Prior service cost/(credit) (1) (1) (3) (1)
Settlement losses and other expenses 3 0 3 0
Net periodic benefit costs $ 19 $ 14 $ 34 $ 29