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Securities Financing Activities (Tables)
 12 Months Ended
Dec. 31, 2019
Offsetting [Abstract]  
Schedule of Resale Agreements The following table presents securities borrowed or purchased under resale agreements:
December 31,
(Dollars in millions)		20192018
Securities purchased under resale agreements$986  $143  
Securities borrowed431  —  
Total securities borrowed or purchased under resale agreements$1,417  $143  
Securities Sold Under Agreements To Repurchase Remaining Contractual Maturity The following table presents the Company’s related activity, by collateral type and remaining contractual maturity:
December 31,
(Dollars in millions)		20192018
Overnight and ContinuousUp to 30 days30-90 daysTotalOvernight and ContinuousUp to 30 daysTotal
U.S. Treasury$115  $35  $—  $150  $—  $2  $2  
GSE87  37  —  124  27  26  53  
Agency MBS - residential928  41  100  1,069  103  93  196  
Corporate and other debt securities310  316  —  626  —  —  —  
Total securities sold under agreements to repurchase$1,440  $429  $100  $1,969  $130  $121  $251