v3.26.1
Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2026
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)2026202520262025
Pension benefits
Service cost$28 $26 $58 $51 
Interest cost59 59 117 119 
Expected return on plan assets(79)(78)(161)(156)
Costs and expenses8 7 14 14 
Remeasurement of projected benefit obligation43 55 (39)108 
Remeasurement of plan assets(190)(54)(87)(31)
Remeasurement (gains) losses(147)1 (126)77 
Pension net (benefit) cost$(139)$8 $(112)$91 
Postretirement benefits
Service cost$— $— $— $— 
Interest cost2 2 4 4 
Amortization of prior service credit— — (1)— 
Costs and expenses2 2 3 4 
Remeasurement of benefit obligation
1 (1)(1)1 
Remeasurement (gains) losses1 (1)(1)1 
Postretirement net cost$3 $1 $2 $5 
Pension and postretirement benefits
Costs and expenses$10 $9 $17 $18 
Remeasurement (gains) losses(146)— (127)78 
Total net (benefit) cost$(136)$9 $(110)$96 
Schedule of Pension and Postretirement Benefits Remeasurement Gains and Losses
Pension and postretirement benefits remeasurement gains and losses
Three months ended June 30,Six months ended June 30,
($ in millions)2026202520262025
Remeasurement of benefit obligation (gains) losses:
Discount rate$4 $5 $(69)$64 
Other assumptions40 49 29 45 
Remeasurement of plan assets (gains) losses(190)(54)(87)(31)
Remeasurement (gains) losses$(146)$— $(127)$78