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Retirement Benefits - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Postretirement Health Care Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 2 1 2
Expected return on plan assets (12) (11) (10)
Amortization of:      
Unrecognized net loss 4 3 3
Unrecognized prior service benefit 0 (5) (15)
Net periodic cost (benefit) (6) (12) (20)
United States | Pension Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0 0 0
Interest cost 128 115 144
Expected return on plan assets (254) (235) (225)
Amortization of:      
Unrecognized net loss 62 70 58
Unrecognized prior service benefit 0 0 0
Net periodic cost (benefit) (64) (50) (23)
Non U.S. | Pension Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 1 2
Interest cost 29 21 29
Expected return on plan assets (93) (99) (85)
Amortization of:      
Unrecognized net loss 14 16 15
Unrecognized prior service benefit (2) (3) (3)
Net periodic cost (benefit) $ (51) $ (64) $ (42)