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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 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 June 30Six Months Ended June 30
Pension
Benefits		OPBPension
Benefits		OPB
$ in millions20252024202520242025202420252024
Components of net periodic benefit cost (benefit)
Service cost$54 $59 $1 $1 $108 $119 $2 $2 
Interest cost402 382 15 16 805 763 31 31 
Expected return on plan assets(539)(549)(21)(22)(1,079)(1,098)(42)(43)
Amortization of prior service credit— — — — — — (1)— 
Other— — — — 7 — — — 
Net periodic benefit cost (benefit)$(83)$(108)$(5)$(5)$(159)$(216)$(10)$(10)
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 Three Months Ended June 30Six Months Ended June 30
$ in millions2025202420252024
Defined benefit pension plans$24 $24 $42 $49 
OPB plans10 9 20 20 
Defined contribution plans155 151 384 381