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Securities (Tables)
 3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Details of Securities
The amortized cost, unrealized gains and losses, and approximate fair value of our securities available for sale and held-to-maturity securities are presented in the following tables. Gross unrealized gains and losses represent the difference between the amortized cost and the fair value of securities on the balance sheet as of the dates indicated. Accordingly, the amount of these gains and losses may change in the future as market conditions change.

 March 31, 2024December 31, 2023
Dollars in millions
Amortized
Cost (a)
Gross Unrealized GainsGross Unrealized Losses
Fair
Value
Amortized
Cost (b)
Gross Unrealized GainsGross Unrealized Losses
Fair
Value
SECURITIES AVAILABLE FOR SALE
U.S. Treasury, agencies, and corporations$9,354 $1 $213 $9,142 $9,300 $6 $280 $9,026 
Agency residential collateralized mortgage obligations
19,285 6 3,575 15,716 18,911 4 3,437 15,478 
Agency residential mortgage-backed securities4,090 — 639 3,451 4,189 — 600 3,589 
Agency commercial mortgage-backed securities 10,276 — 1,287 8,989 10,295 — 1,203 9,092 
Total securities available for sale $43,005 $7 $5,714 $37,298 $42,695 $10 $5,520 $37,185 
HELD-TO-MATURITY SECURITIES
Agency residential collateralized mortgage obligations
$5,025 $2 $341 $4,686 $5,170 $9 $283 $4,896 
Agency residential mortgage-backed securities162 — 17 145 165 — 13 152 
Agency commercial mortgage-backed securities2,448 — 216 2,232 2,473 1 204 2,270 
Asset-backed securities (c)
611 — 19 592 738 — 29 709 
Other securities26 — 1 25 29 — — 29 
Total held-to-maturity securities$8,272 $2 594 $7,680 $8,575 $10 $529 $8,056 
(a)Amortized cost amounts exclude accrued interest receivable which is recorded within Other Assets on the balance sheet. At March 31, 2024, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $69 million and $24 million, respectively.
(b)Amortized cost amounts exclude accrued interest receivable which is recorded within Other Assets on the balance sheet. At December 31, 2023, accrued interest receivable on available for sale securities and held-to-maturity securities totaled $64 million and $25 million, respectively.
(c)Consists primarily of $606 million of securities as of March 31, 2024, and $731 million of securities as of December 31, 2023, related to the purchase of senior notes from a securitization collateralized by sold indirect auto loans.
Schedule of Securities in an Unrealized Loss Position
The following table summarizes securities in an unrealized loss position for which an allowance for credit losses has not been recorded as of March 31, 2024, and December 31, 2023.

 Duration of Unrealized Loss Position  
 Less than 12 Months12 Months or LongerTotal
Dollars in millions
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
March 31, 2024
Securities available for sale:
U.S Treasury, agencies, and corporations
$960 $5 $7,939 $208 $8,899 $213 
Agency residential collateralized mortgage obligations
200 1 14,471 3,574 14,671 3,575 
Agency residential mortgage-backed securities
— — 3,448 639 3,448 639 
Agency commercial mortgage-backed securities
836 62 8,153 1,225 8,989 1,287 
Held-to-maturity securities:
Agency residential collateralized mortgage obligations
716 16 3,563 325 4,279 341 
Agency residential mortgage-backed securities
— — 145 17 145 17 
Agency commercial mortgage-backed securities
23 — 2,162 216 2,185 216 
Asset-backed securities
— — 592 19 592 19 
Other securities
10 — 10 1 20 1 
Total securities in an unrealized loss position$2,745 $84 $40,483 $6,224 $43,228 $6,308 
December 31, 2023
Securities available for sale:
U.S. Treasury, agencies, and corporations
$— $— $8,532 $280 $8,532 $280 
Agency residential collateralized mortgage obligations— — 14,979 3,437 14,979 3,437 
Agency residential mortgage-backed securities
24 — 

3,562 600 3,586 600 
Agency commercial mortgage-backed securities 891 49 8,201 1,154 9,092 1,203 
Held-to-maturity securities:
Agency residential collateralized mortgage obligations1,123 30 3,070 253 4,193 283 
Agency residential mortgage-backed securities
— — 152 13 152 13 
Agency commercial mortgage-backed securities — — 2,199 204 2,199 204 
Asset-backed securities
— — 709 29 709 29 
Other securities
17 — 
(a)
12 — 29 — 
Total securities in an unrealized loss position$2,055 $79 $41,416 $5,970 $43,471 $6,049 
    
(a)At December 31, 2023, gross unrealized losses totaled less than $1 million for other securities held-to-maturity with a loss duration of less than 12 months.
Schedule of Securities by Maturity
The following table shows our securities by remaining maturity at March 31, 2024. CMOs, other mortgage-backed securities, and asset-backed securities in the available for sale portfolio and held-to-maturity portfolio are presented based on their expected average lives. The remaining securities, in both the available-for-sale and held-to-maturity portfolios, are presented based on their remaining contractual maturity. Actual maturities may differ from expected or contractual maturities since borrowers have the right to prepay obligations with or without prepayment penalties.

March 31, 2024Securities Available for SaleHeld to Maturity Securities
Dollars in millionsAmortized CostFair ValueAmortized CostFair Value
Due in one year or less$7,707 $7,539 $624 $604 
Due after one through five years9,648 8,923 4,164 3,916 
Due after five through ten years18,828 15,614 2,382 2,145 
Due after ten years6,822 5,222 1,102 1,015 
Total$43,005 $37,298 $8,272 $7,680