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Benefit Plans - Pension Costs (Details) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 9 $ 12
Interest cost 16 15
Expected return on plan assets (22) (22)
Net loss from experience differences 5 11
Prior service cost/(credit) 0 1
Settlement losses 4 7
Net periodic benefit costs 12 24
Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 31 38
Interest cost 51 52
Expected return on plan assets (103) (117)
Net loss from experience differences 38 42
Prior service cost/(credit) (2) 0
Settlement losses 0 0
Net periodic benefit costs $ 15 $ 15