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Retirement Benefits (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 2021
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 millions20212020202120202021202020212020
Components of net periodic benefit cost (benefit)
Service cost$103 $102 $4 $5 $207 $204 $8 $9 
Interest cost264 306 14 16 527 613 27 33 
Expected return on plan assets(629)(594)(27)(25)(1,257)(1,188)(53)(51)
Amortization of prior service (credit) cost(2)(15)(1)1 (4)(30)(1)2 
Net periodic benefit cost (benefit)$(264)$(201)$(10)$(3)$(527)$(401)$(19)$(7)
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 millions2021202020212020
Defined benefit pension plans$26 $26 $53 $46 
OPB plans10 11 21 23 
Defined contribution plans111 100 377 356