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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]              
Amortization of actuarial loss $ (7) $ (6) $ (31) $ (42)      
Other Postretirement Benefits              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]              
Service cost         $ 1 $ 4 $ 0
Interest cost         6 6 6
Amortization of actuarial loss         3 4 4
Amortization of prior service cost         (34) (37) (40)
Net periodic cost / (benefit)         (24) (23) (30)
U.S. Plans | Pension Plan              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]              
Service cost         15 17 14
Interest cost         50 47 50
Expected return on plan assets         (70) (85) (83)
Amortization of actuarial loss         55 51 52
Amortization of prior service cost         1 1 1
Net periodic cost / (benefit)         51 31 34
Non-U.S. Plans | Pension Plan              
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]              
Service cost         15 26 22
Interest cost         71 75 75
Expected return on plan assets         (138) (159) (146)
Settlements         44 38 0
Curtailments         (14) 0 (3)
Amortization of actuarial loss         38 45 42
Amortization of prior service cost         (1) (11) (11)
Net periodic cost / (benefit)         $ 15 $ 14 $ (21)