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Retirement Benefits (Schedule of Benefit Obligations and Plan Assets and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 17,565.0 $ 18,225.5  
Service cost 351.7 369.2 $ 325.5
Interest cost 398.1 337.8 425.8
Actuarial (gain) loss (4,158.9) (564.3)  
Benefits paid (608.9) (630.1)  
Foreign currency exchange rate changes and other adjustments (325.0) (173.1)  
Benefit obligation at end of year 13,222.0 17,565.0 18,225.5
Change in plan assets:      
Fair value of plan assets at beginning of year 16,416.0 14,579.0  
Actual return on plan assets (2,388.1) 2,458.1  
Employer contribution 118.1 131.2  
Benefits paid (608.9) (630.1)  
Foreign currency exchange rate changes and other adjustments (341.3) (122.2)  
Fair value of plan assets at end of year 13,195.8 16,416.0 14,579.0
Funded status (26.2) (1,149.0)  
Unrecognized net actuarial (gain) loss 2,687.2 3,908.2  
Unrecognized prior service (benefit) cost 8.4 11.2  
Net amount recognized 2,669.4 2,770.4  
Retiree Health Benefit Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 1,663.8 1,753.7  
Service cost 46.6 49.2 40.8
Interest cost 37.8 32.5 43.7
Actuarial (gain) loss (395.9) (86.1)  
Benefits paid (86.8) (79.3)  
Foreign currency exchange rate changes and other adjustments (6.7) (6.2)  
Benefit obligation at end of year 1,258.8 1,663.8 1,753.7
Change in plan assets:      
Fair value of plan assets at beginning of year 3,361.4 3,227.0  
Actual return on plan assets (796.0) 202.6  
Employer contribution 13.9 11.1  
Benefits paid (86.8) (79.3)  
Foreign currency exchange rate changes and other adjustments 0.0 0.0  
Fair value of plan assets at end of year 2,492.5 3,361.4 $ 3,227.0
Funded status 1,233.7 1,697.6  
Unrecognized net actuarial (gain) loss 54.5 (497.2)  
Unrecognized prior service (benefit) cost (62.2) (117.6)  
Net amount recognized $ 1,226.0 $ 1,082.8