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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
Mar. 31, 2025
Dec. 31, 2024
Securities Purchased under Agreements to Resell [Abstract]    
Gross amounts of recognized assets $ 681 $ 572
Gross amounts offset in the Balance Sheets 0 0
Net amounts of assets presented in the Balance Sheets 681 572
Offsetting securities sold under agreements to repurchase 0 0
Securities collateral (not recognized on FHN’s Balance Sheets) (676) (567)
Net amount $ 5 $ 5