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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2025
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 millions20252024202520242025202420252024
Components of net periodic benefit cost (benefit)
Service cost$55 $60 $1 $1 $163 $179 $3 $3 
Interest cost404 381 16 15 1,209 1,144 47 46 
Expected return on plan assets(540)(549)(22)(21)(1,619)(1,647)(64)(64)
Amortization of prior service credit— — (1)— — — (2)— 
Other— — — — 7 — — — 
Net periodic benefit cost (benefit)$(81)$(108)$(6)$(5)$(240)$(324)$(16)$(15)
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 millions2025202420252024
Defined benefit pension plans$25 $17 $67 $66 
OPB plans7 7 27 27 
Defined contribution plans133 136 517 517