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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2023
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 millions2023202220232022
Components of net periodic benefit cost (benefit)
Service cost$59 $92 $1 $2 
Interest cost392 284 17 12 
Expected return on plan assets(524)(660)(21)(28)
Net periodic benefit cost (benefit)$(73)$(284)$(3)$(14)
Employer contributions to retirement plans Contributions made by the company to its retirement plans are as follows:
 Three Months Ended March 31
$ in millions20232022
Defined benefit pension plans$29 $26 
OPB plans11 10 
Defined contribution plans215 199