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Retirement Benefits (Unaudited) (Tables)
 9 Months Ended
Sep. 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 September 30Nine Months Ended September 30
Pension
Benefits		OPBPension
Benefits		OPB
$ in millions20242023202420232024202320242023
Components of net periodic benefit cost (benefit)
Service cost$60 $59 $1 $2 $179 $177 $3 $4 
Interest cost381 392 15 17 1,144 1,176 46 50 
Expected return on plan assets(549)(524)(21)(22)(1,647)(1,573)(64)(64)
Net periodic benefit cost (benefit)$(108)$(73)$(5)$(3)$(324)$(220)$(15)$(10)
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 millions2024202320242023
Defined benefit pension plans$17 $26 $66 $80 
OPB plans7 7 27 28 
Defined contribution plans136 126 517 487