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Pension and Other Postretirement Benefits (Components of Pension Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]            
Amortization of actuarial loss   $ 1        
Other Postretirement Benefits            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]            
Service cost       $ 4 $ 0 $ 0
Interest cost       6 6 6
Amortization of actuarial loss     $ (4) 4 4 5
Amortization of prior service cost (credit)       (37) (40) (41)
Net periodic cost / (benefit)       (23) (30) (30)
U.S. Plans | Pension Plan            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]            
Service cost       17 14 14
Interest cost       47 50 50
Expected return on plan assets       (85) (83) (91)
Settlements       0 0 14
Amortization of actuarial loss       51 52 50
Amortization of prior service cost (credit)       1 1 1
Net periodic cost / (benefit)       31 34 38
Non-U.S. Plans | Pension Plan            
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]            
Service cost       26 22 21
Interest cost       75 75 101
Expected return on plan assets       (159) (146) (157)
Settlements       38 0 0
Curtailments       0 (3) 0
Amortization of actuarial loss $ 42     45 42 50
Amortization of prior service cost (credit)       (11) (11) (12)
Net periodic cost / (benefit)       $ 14 $ (21) $ 3