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Retirement Benefits (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2022
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 millions2022202120222021
Components of net periodic benefit cost (benefit)
Service cost$92 $104 $2 $4 
Interest cost284 263 12 13 
Expected return on plan assets(660)(628)(28)(26)
Amortization of prior service (credit) cost— (2)— — 
Net periodic benefit cost (benefit)$(284)$(263)$(14)$(9)
Employer contributions to retirement plans Contributions made by the company to its retirement plans are as follows:
 Three Months Ended March 31
$ in millions20222021
Defined benefit pension plans$26 $27 
OPB plans10 11 
Defined contribution plans199 266