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Employee Postretirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Pension Plans      
Service cost $ 12 $ 13 $ 16
Interest cost 115 121 89
Expected return on plan assets(a) [1] (124) (128) (123)
Recognized net actuarial (gain) loss 40 39 34
Settlements and curtailments (2) (35) (52)
Other 0 0 1
Net periodic benefit cost 45 80 69
Other Postretirement Benefit Plans      
Service cost 4 4 7
Interest cost 28 30 21
Expected return on plan assets(a) [1] 0 0 0
Recognized net actuarial (gain) loss 0 (3) 1
Settlements and curtailments 0 0 0
Other 0 1 (1)
Net periodic benefit cost $ 32 $ 32 $ 28
[1] The expected return on plan assets is determined by multiplying the fair value of plan assets at the remeasurement date, typically the prior year-end adjusted for estimated current year cash benefit payments and contributions, by the expected long-term rate of return.