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Retirement Benefits - Net Periodic Pension Costs (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amortization of:      
Settlement loss $ 0 $ 48 $ 26
Postretirement Health Care Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 2 3 4
Expected return on plan assets (10) (10) (9)
Amortization of:      
Unrecognized net loss 4 5 5
Unrecognized prior service benefit (15) (18) (27)
Settlement loss 0 0 0
Net periodic cost (benefit) (19) (20) (27)
U.S. | Pension Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 186 185 182
Expected return on plan assets (270) (229) (220)
Amortization of:      
Unrecognized net loss 57 44 37
Unrecognized prior service benefit 0 0 0
Settlement loss 0 0 0
Net periodic cost (benefit) (27) 0 (1)
Non U.S. | Pension Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3 3 11
Interest cost 38 40 55
Expected return on plan assets (92) (92) (93)
Amortization of:      
Unrecognized net loss 15 16 11
Unrecognized prior service benefit 0 0 0
Settlement loss 0 48 26
Net periodic cost (benefit) $ (36) $ 15 $ 10