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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2024
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 millions20242023202420232024202320242023
Components of net periodic benefit cost (benefit)
Service cost$59 $59 $1 $1 $119 $118 $2 $2 
Interest cost382 392 16 16 763 784 31 33 
Expected return on plan assets(549)(525)(22)(21)(1,098)(1,049)(43)(42)
Net periodic benefit cost (benefit)$(108)$(74)$(5)$(4)$(216)$(147)$(10)$(7)
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 millions2024202320242023
Defined benefit pension plans$24 $25 $49 $54 
OPB plans9 10 20 21 
Defined contribution plans151 146 381 361