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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost
Net periodic benefit cost (income) consisted of the following:
PensionPostretirementPensionPostretirement
For the Nine Months Ended September 30,For the Three Months Ended September 30,
 (in millions)20252024202520242025202420252024
Service cost$28 $31 $8 $11 $10 $10 $2 $3 
Interest cost237 242 42 46 78 81 14 14 
Expected return on plan assets
(322)(349)(3)(4)(107)(116)(1)(1)
Amortization:
Net loss (gain)37 21 (9)(4)12 8 (3)(2)
Prior service cost (credit)
4 4 (31)(30)2 1 (11)(10)
Net periodic benefit cost (income)$(16)$(51)$7 $19 $(5)$(16)$1 $4