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Investment Securities - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Remaining unamortized loss on securities transferred to held to maturity, net of tax $ 11,500,000,000  
Remaining unamortized loss on securities transferred to held to maturity, pretax 15,000,000,000  
Held to maturity securities, assets pledged [1] 159,452,000,000 $ 173,074,000,000
Available for sale securities, assets pledged [1] 107,646,000,000 147,871,000,000
Available-for-sale, written down to fair value 0 0
Writedown to fair value 0 0
Available-for-sale, allowance for credit loss 0 0
Held-to-maturity securities, allowance for credit loss 0 0
Accrued interest receivable 565,000,000 685,000,000
Write-off of accrued interest receivable on available for sale and held to maturity securities $ 0  
Estimated effective duration of available for sale and held to maturity investment securities portfolio 4 years  
Estimated effective duration of available for sale investment securities portfolio 2 years 6 months  
Impact of derivative instruments on estimated effective duration for available for sale and held to maturity investment securities portfolio 3 years 10 months 24 days  
Impact of derivative instruments on estimated effective duration for available for sale investment securities portfolio 2 years 2 months 12 days  
Federal Home Loan Bank Advances    
Debt Securities, Available-for-sale [Line Items]    
Fair value of pledged securities $ 70,100,000,000  
Federal Reserve Bank Advances    
Debt Securities, Available-for-sale [Line Items]    
Fair value of pledged securities 6,200,000,000  
Federal Reserve Bank Term Funding Program (BTFP)    
Debt Securities, Available-for-sale [Line Items]    
Fair value of pledged securities 39,200,000,000  
Asset Pledged as Collateral    
Debt Securities, Available-for-sale [Line Items]    
Held to maturity securities, assets pledged 3,703,000,000 4,522,000,000
Available for sale securities, assets pledged [1] 1,733,000,000 41,000,000
Asset Pledged as Collateral | Interest rate swaps    
Debt Securities, Available-for-sale [Line Items]    
Available for sale securities, assets pledged 195,000,000  
U.S. agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Transfers of available for sale securities to held to maturity   188,600,000,000
Pretax unrealized loss from transfers of available for sale securities to held to maturity   18,200,000,000
Held to maturity securities, assets pledged 159,452,000,000 173,074,000,000
Available for sale securities, assets pledged 62,795,000,000 $ 77,688,000,000
U.S. agency mortgage-backed securities | Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase    
Debt Securities, Available-for-sale [Line Items]    
Held to maturity securities, assets pledged 3,700,000,000  
Available for sale securities, assets pledged 1,500,000,000  
Deposits    
Debt Securities, Available-for-sale [Line Items]    
Fair value of pledged securities $ 1,600,000,000  
[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.