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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The cost to the company of its pension and other postretirement benefit (OPB) plans is shown in the following table:
Three Months Ended September 30Nine Months Ended September 30
Pension
Benefits		OPBPension
Benefits		OPB
$ in millions20262025202620252026202520262025
Components of net periodic benefit cost (benefit)
Service cost$53 $55 $1 $1 $159 $163 $3 $3 
Interest cost398 404 15 16 1,196 1,209 44 47 
Expected return on plan assets(565)(540)(22)(22)(1,695)(1,619)(66)(64)
Amortization of prior service credit— — (1)(1)— — (2)(2)
Other— — — — — 7 — — 
Net periodic benefit cost (benefit)$(114)$(81)$(7)$(6)$(340)$(240)$(21)$(16)
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
Three Months Ended September 30Nine Months Ended September 30
$ in millions2026202520262025
Defined benefit pension plans$24 $25 $66 $67 
OPB plans5 7 26 27 
Defined contribution plans145 133 532 517