v3.24.2
Retirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
United States [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 10 $ 14 $ 21 $ 28
Interest cost 49 49 98 98
Expected return on plan assets (75) (76) (151) (152)
Settlements 0 1 0 1
Amortization of net loss 9 3 18 6
Amortization of prior service credit 0 0 0 0
Net periodic benefit (income)/cost (7) (9) (14) (19)
United Kingdom [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 2 3 3
Interest cost 29 30 57 59
Expected return on plan assets (40) (41) (79) (80)
Settlements 0 0 0 0
Amortization of net loss 13 12 27 24
Amortization of prior service credit (3) (3) (6) (6)
Net periodic benefit (income)/cost 1 0 2 0
Other Foreign Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 4 8 7
Interest cost 6 7 13 14
Expected return on plan assets (11) (10) (21) (19)
Settlements 0 (1) 0 (1)
Amortization of net loss 1 0 1 0
Amortization of prior service credit 0 1 0 1
Net periodic benefit (income)/cost $ 0 $ 1 $ 1 $ 2