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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 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 March 31
Pension
Benefits		OPB
$ in millions2024202320242023
Components of net periodic benefit cost (benefit)
Service cost$60 $59 $1 $1 
Interest cost381 392 15 17 
Expected return on plan assets(549)(524)(21)(21)
Net periodic benefit cost (benefit)$(108)$(73)$(5)$(3)
Employer contributions to retirement plans
Contributions made by the company to its retirement plans are as follows:
 Three Months Ended March 31
$ in millions20242023
Defined benefit pension plans$25 $29 
OPB plans11 11 
Defined contribution plans230 215