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Securities Financing Activities (Tables)
 12 Months Ended
Dec. 31, 2021
Offsetting [Abstract]  
Schedule of Resale Agreements The following table presents securities borrowed or purchased under agreements to resell:
December 31,
(Dollars in millions)		20212020
Securities purchased under agreements to resell$3,460 $1,158 
Securities borrowed568 587 
Total securities borrowed or purchased under agreements to resell$4,028 $1,745 
Schedule of Repurchase Agreements The following table presents the Company’s related activity, by collateral type and remaining contractual maturity:
December 31,
(Dollars in millions)		20212020
Overnight and ContinuousUp to 30 daysTotalOvernight and ContinuousUp to 30 daysTotal
U.S. Treasury$749 $409 $1,158 $305 $31 $336 
GSE53 25 78 45 9 54 
Agency MBS - residential720 141 861 442 6 448 
Corporate and other debt securities213 125 338 204 179 383 
Total securities sold under agreements to repurchase$1,735 $700 $2,435 $996 $225 $1,221