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Retirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]          
Settlements       $ 82  
United States [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 10   $ 10 20 $ 21
Interest cost 32   49 68 98
Expected return on plan assets (51)   (75) (106) (151)
Settlements   $ 82   82 0
Amortization of net loss 7   9 16 18
Amortization of prior service credit 0   0 0 0
Net periodic benefit cost/(income) (2)   (7) 80 (14)
United Kingdom [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 2   2 3 3
Interest cost 31   29 60 57
Expected return on plan assets (45)   (40) (87) (79)
Settlements       3 0
Amortization of net loss 16   13 31 27
Amortization of prior service credit (1)   (3) (2) (6)
Net periodic benefit cost/(income) 3   1 8 2
Other Foreign Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 4   4 7 8
Interest cost 7   6 13 13
Expected return on plan assets (12)   (11) (22) (21)
Settlements       0 0
Amortization of net loss 0   1 0 1
Amortization of prior service credit 0   0 0 0
Net periodic benefit cost/(income) $ (1)   $ 0 $ (2) $ 1