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Master Netting and Similar Agreements—Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Securities Purchased under Agreements to Resell and Collateral Pledged by Counterparties (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Securities Purchased under Agreements to Resell [Abstract]    
Gross amounts of recognized assets $ 796 $ 519
Gross amounts offset in the Balance Sheets 0 0
Net amounts of assets presented in the Balance Sheets 796 519
Offsetting securities sold under agreements to repurchase 0 0
Securities collateral (not recognized on FHN’s Balance Sheets) (791) (516)
Net amount $ 5 $ 3