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Cash and Cash Equivalents
 12 Months Ended
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents Cash and Cash Equivalents
The following table details our cash and cash equivalents at December 31, 2021 and December 31, 2020:
(Dollars in millions)December 31, 2021December 31, 2020
Cash and due from banks $2,201 $723 
Interest bearing deposits with the FRB5,686 13,700 
Interest bearing deposits with other institutions5,773 3,025 
Securities purchased under agreements to resell (1)607 227 
Other short-term investment securities352 — 
Total cash and cash equivalents$14,619 $17,675 
(1)At December 31, 2021 and December 31, 2020, securities purchased under agreements to resell were collateralized by U.S. Treasury securities and U.S. agency securities with aggregate fair values of $620 million and $232 million, respectively. None of these securities were sold or repledged as of December 31, 2021 and December 31, 2020.

Additional information regarding our securities purchased under agreements to resell for 2021 and 2020 are as follows:
Year ended December 31,
(Dollars in millions)20212020
Average securities purchased under agreements to resell$286 $149 
Maximum amount outstanding at any month-end during the year762 450