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Stock Compensation Plans and Other Compensation Arrangements (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Nonvested Restricted Stock Shares Activity [Table Text Block] The following table presents the number of restricted stock rights (RSRs) and restricted performance stock rights (RPSRs) granted to employees under the company’s long-term incentive stock plan and the grant date aggregate fair value of those stock awards for the periods presented:
Three Months Ended March 31
in millions20222021
RSRs granted0.1 0.1 
RPSRs granted0.2 0.2 
Grant date aggregate fair value$88 $88 
Cash Units and Cash Performance Units Aggregate Payout Amount [Table Text Block] The following table presents the minimum and maximum aggregate payout amounts related to cash units (CUs) and cash performance units (CPUs) granted to employees in the periods presented:
Three Months Ended March 31
$ in millions20222021
Minimum aggregate payout amount$32 $31 
Maximum aggregate payout amount182 177