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Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Cost (Benefit) for Pension and Other Postretirement Plans
Components of net cost (benefit) for pension and other postretirement plans
Three months ended June 30,Six months ended June 30,
($ in millions)2024202320242023
Pension benefits
Service cost$(7)$32 $26 $65 
Interest cost58 58 116 118 
Expected return on plan assets(76)(79)(153)(156)
Costs and expenses(25)11 (11)27 
Remeasurement of projected benefit obligation(68)(68)(93)55 
Remeasurement of plan assets60 30 85 (150)
Remeasurement (gains) losses(8)(38)(8)(95)
Pension net benefit$(33)$(27)$(19)$(68)
Postretirement benefits
Service cost$— $— $— $— 
Interest cost
Amortization of prior service credit(1)(6)(1)(12)
Costs and expenses2 (4)4 (7)
Remeasurement of projected benefit obligation(1)(2)(3)
Remeasurement of plan assets— — — — 
Remeasurement (gains) losses(1)(2)(3)2 
Postretirement net cost (benefit)$1 $(6)$1 $(5)
Pension and postretirement benefits
Costs and expenses$(23)$$(7)$20 
Remeasurement (gains) losses(9)(40)(11)(93)
Total net benefit$(32)$(33)$(18)$(73)
Schedule of Pension and Postretirement Benefits Remeasurement Gains and Losses
Pension and postretirement benefits remeasurement gains and losses
Three months ended June 30,Six months ended June 30,
($ in millions)2024202320242023
Remeasurement of projected benefit obligation (gains) losses:
Discount rate$(57)$(73)$(98)$51 
Other assumptions(12)
Remeasurement of plan assets (gains) losses60 30 85 (150)
Remeasurement (gains) losses$(9)$(40)$(11)$(93)