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Benefit Plans - Pension Costs (Details) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Simplify to Grow Program        
Defined Benefit Plan Disclosure [Line Items]        
Settlement losses and other expenses $ 2 $ 3 $ 7 $ 3
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 10 11 28 33
Interest cost 15 16 46 46
Expected return on plan assets (22) (22) (66) (66)
Net loss from experience differences 9 6 19 26
Prior service cost/(credit) 0 0 1 1
Settlement losses and other expenses 5 4 13 19
Net periodic benefit costs 17 15 41 59
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 30 36 91 111
Interest cost 49 49 151 151
Expected return on plan assets (99) (110) (303) (341)
Net loss from experience differences 36 40 111 124
Prior service cost/(credit) (2) (1) (5) (2)
Settlement losses and other expenses 0 0 3 0
Net periodic benefit costs $ 14 $ 14 $ 48 $ 43