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Benefit Plans - Pension Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Settlement losses and other expenses $ 7 $ 3
Pension Plans | U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 12 12
Interest cost 15 15
Expected return on plan assets (22) (25)
Net loss from experience differences 11 8
Prior service cost/(benefit) 1 1
Settlement losses and other expenses 7 3
Net periodic benefit costs 24 14
Pension Plans | Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 38 39
Interest cost 52 48
Expected return on plan assets (117) (104)
Net loss from experience differences 42 41
Prior service cost/(benefit) 0 (1)
Settlement losses and other expenses 0 1
Net periodic benefit costs $ 15 $ 24