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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 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 June 30Six Months Ended June 30
Pension
Benefits		OPBPension
Benefits		OPB
$ in millions20232022202320222023202220232022
Components of net periodic benefit cost (benefit)
Service cost$59 $92 $1 $2 $118 $184 $2 $4 
Interest cost392 284 16 12 784 568 33 24 
Expected return on plan assets(525)(661)(21)(27)(1,049)(1,321)(42)(55)
Amortization of prior service (credit) cost— — — (1)— — — (1)
Net periodic benefit cost (benefit)$(74)$(285)$(4)$(14)$(147)$(569)$(7)$(28)
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 millions2023202220232022
Defined benefit pension plans$25 $25 $54 $51 
OPB plans10 10 21 20 
Defined contribution plans146 122 361 321