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Retirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]          
Settlements       $ 82  
United States [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 10   $ 11 30 $ 32
Interest cost 32   49 100 147
Expected return on plan assets (51)   (76) (157) (227)
Settlements 1 $ 82 0 83 0
Amortization of net loss 7   9 23 27
Amortization of prior service credit 0   0 0 0
Net periodic benefit cost/(income) (1)   (7) 79 (21)
United Kingdom [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1   1 4 4
Interest cost 31   29 91 86
Expected return on plan assets (44)   (40) (131) (119)
Settlements 0   0 3 0
Amortization of net loss 16   14 47 41
Amortization of prior service credit (2)   (3) (4) (9)
Net periodic benefit cost/(income) 2   1 10 3
Other Foreign Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 3   4 10 12
Interest cost 7   7 20 20
Expected return on plan assets (12)   (11) (34) (32)
Settlements 0   0 0 0
Amortization of net loss 1   0 1 1
Amortization of prior service credit 0   1 0 1
Net periodic benefit cost/(income) $ (1)   $ 1 $ (3) $ 2