v3.24.3
Retirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
United States [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 11 $ 14 $ 32 $ 42
Interest cost 49 48 147 146
Expected return on plan assets (76) (76) (227) (228)
Settlements     0 1
Amortization of net loss 9 3 27 9
Amortization of prior service credit 0 0 0 0
Net periodic benefit (income)/cost (7) (11) (21) (30)
United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 29 31 86 90
Expected return on plan assets (40) (41) (119) (121)
Settlements     0 0
Amortization of net loss 14 12 41 36
Amortization of prior service credit (3) (3) (9) (9)
Net periodic benefit (income)/cost 1 0 3 0
Other Foreign Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 4 12 11
Interest cost 7 7 20 21
Expected return on plan assets (11) (10) (32) (29)
Settlements     0 (1)
Amortization of net loss 0 0 1 0
Amortization of prior service credit 1 0 1 1
Net periodic benefit (income)/cost $ 1 $ 1 $ 2 $ 3