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Master Netting and Similar Agreements - Repurchase, Reverse Repurchase, and Securities Borrowing Transactions - Schedule of Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Securities Purchased under Agreements to Resell [Abstract]    
Gross amounts of recognized assets $ 519 $ 353
Gross amounts offset in the Balance Sheets 0 0
Net amounts of assets presented in the Balance Sheets 519 353
Offsetting securities sold under agreements to repurchase 0 (10)
Securities collateral (not recognized on FHN’s Balance Sheets) (516) (340)
Net amount $ 3 $ 3