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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Held-to-Maturity Investment Securities
The amortized cost, gross unrealized holding gains and losses, and fair value of held-to-maturity and available-for-sale investment securities at December 31 were as follows:
 20242023
(Dollars in Millions)Amortized CostUnrealized GainsUnrealized Losses Fair ValueAmortized CostUnrealized GainsUnrealized Losses Fair Value
Held-to-Maturity
U.S. Treasury and agencies$1,296 $— $(21)$1,275 $1,345 $— $(35)$1,310 
Mortgage-backed securities
Residential agency75,392 3 (12,317)63,078 80,997 6 (9,929)71,074 
Commercial agency1,702 — (27)1,675 1,695 6 (5)1,696 
Other244 3 — 247 8 — — 8 
Total held-to-maturity$78,634 $6 $(12,365)$66,275 $84,045 $12 $(9,969)$74,088 
Available-for-Sale
U.S. Treasury and agencies$30,467 $1 $(2,081)$28,387 $21,768 $8 $(2,234)$19,542 
Mortgage-backed securities        
Residential agency35,558 13 (2,290)33,281 28,185 104 (2,211)26,078 
Commercial
Agency8,673 — (1,322)7,351 8,703 — (1,360)7,343 
Non-agency7 — (1)6 7 — (1)6 
Asset-backed securities7,136 30 (1)7,165 6,713 25 (14)6,724 
Obligations of state and political subdivisions10,690 13 (1,151)9,552 10,867 36 (914)9,989 
Other249 1 — 250 24 — — 24 
Total available-for-sale, excluding portfolio level basis adjustments92,780 58 (6,846)85,992 76,267 173 (6,734)69,706 
Portfolio level basis adjustments (a)
13 — (13)— 335 — (335)— 
Total available-for-sale$92,793 $58 $(6,859)$85,992 $76,602 $173 $(7,069)$69,706 
(a)Represents fair value hedge basis adjustments related to active portfolio layer method hedges of available-for-sale investment securities, which are not allocated to individual securities in the portfolio. For additional information, refer to Note 19.
Available-for-Sale Investment Securities
The amortized cost, gross unrealized holding gains and losses, and fair value of held-to-maturity and available-for-sale investment securities at December 31 were as follows:
 20242023
(Dollars in Millions)Amortized CostUnrealized GainsUnrealized Losses Fair ValueAmortized CostUnrealized GainsUnrealized Losses Fair Value
Held-to-Maturity
U.S. Treasury and agencies$1,296 $— $(21)$1,275 $1,345 $— $(35)$1,310 
Mortgage-backed securities
Residential agency75,392 3 (12,317)63,078 80,997 6 (9,929)71,074 
Commercial agency1,702 — (27)1,675 1,695 6 (5)1,696 
Other244 3 — 247 8 — — 8 
Total held-to-maturity$78,634 $6 $(12,365)$66,275 $84,045 $12 $(9,969)$74,088 
Available-for-Sale
U.S. Treasury and agencies$30,467 $1 $(2,081)$28,387 $21,768 $8 $(2,234)$19,542 
Mortgage-backed securities        
Residential agency35,558 13 (2,290)33,281 28,185 104 (2,211)26,078 
Commercial
Agency8,673 — (1,322)7,351 8,703 — (1,360)7,343 
Non-agency7 — (1)6 7 — (1)6 
Asset-backed securities7,136 30 (1)7,165 6,713 25 (14)6,724 
Obligations of state and political subdivisions10,690 13 (1,151)9,552 10,867 36 (914)9,989 
Other249 1 — 250 24 — — 24 
Total available-for-sale, excluding portfolio level basis adjustments92,780 58 (6,846)85,992 76,267 173 (6,734)69,706 
Portfolio level basis adjustments (a)
13 — (13)— 335 — (335)— 
Total available-for-sale$92,793 $58 $(6,859)$85,992 $76,602 $173 $(7,069)$69,706 
(a)Represents fair value hedge basis adjustments related to active portfolio layer method hedges of available-for-sale investment securities, which are not allocated to individual securities in the portfolio. For additional information, refer to Note 19.
Interest Income from Taxable and Non-Taxable Investment Securities
The following table provides information about the amount of interest income from taxable and non-taxable investment securities:
Year Ended December 31 (Dollars in Millions)202420232022
Taxable$4,808 $4,171 $3,081 
Non-taxable303 314 297 
Total interest income from investment securities$5,111 $4,485 $3,378 
Gross Gains and Losses Realized through Sales of Available-for-Sale Investment Securities
The following table provides information about the amount of gross gains and losses realized through the sales of available-for-sale investment securities:
Year Ended December 31 (Dollars in Millions)202420232022
Realized gains$147 $74 $163 
Realized losses(301)(219)(143)
Net realized gains (losses)$(154)$(145)$20 
Income tax expense (benefit) on net realized gains (losses)$(39)$(37)$5 
Gross Unrealized Losses and Fair Value of Investment Securities The following table shows the gross unrealized losses excluding portfolio level basis adjustments and fair value of the Company’s available-for-sale investment securities with unrealized losses, aggregated by investment category and length of time the individual investment securities have been in continuous unrealized loss positions, at December 31, 2024:
Less Than 12 Months 12 Months or Greater Total
(Dollars in Millions)Fair ValueUnrealized Losses Fair ValueUnrealized Losses Fair ValueUnrealized Losses
U.S. Treasury and agencies$9,236 $(28)$16,978 $(2,053)$26,214 $(2,081)
Mortgage-backed securities
Residential agency15,369 (275)15,738 (2,015)31,107 (2,290)
Commercial
Agency— — 7,351 (1,322)7,351 (1,322)
Non-agency— — 7 (1)7 (1)
Asset-backed securities35 — 1,164 (1)1,199 (1)
Obligations of state and political subdivisions1,697 (21)7,435 (1,130)9,132 (1,151)
Other2 — 4 — 6 — 
Total investment securities$26,339 $(324)$48,677 $(6,522)$75,016 $(6,846)
Amortized Cost, Fair Value and Yield by Maturity Date
The following table provides information about the amortized cost, fair value and yield by maturity date of the investment securities outstanding at December 31, 2024:
(Dollars in Millions)Amortized
 Cost		Fair ValueWeighted-
 Average
 Maturity in
 Years
Weighted-
Average
 Yield(e)
 
Held-to-Maturity
U.S. Treasury and agencies
Maturing in one year or less$650 $647 0.42.71 %
Maturing after one year through five years646 628 2.33.00 
Maturing after five years through ten years— — — — 
Maturing after ten years— — — — 
Total$1,296 $1,275 1.32.85 %
Mortgage-backed securities(a)
Maturing in one year or less$42 $41 0.84.52 %
Maturing after one year through five years2,110 2,091 3.54.49 
Maturing after five years through ten years73,667 61,626 9.02.12 
Maturing after ten years1,275 995 10.12.18 
Total$77,094 $64,753 8.82.19 %
Other
Maturing in one year or less$19 $16 0.23.24 %
Maturing after one year through five years225 231 2.42.68 
Maturing after five years through ten years— — — — 
Maturing after ten years— — — — 
Total$244 $247 2.22.73 %
Total held-to-maturity(b)
$78,634 $66,275 8.72.20 %
Available-for-Sale
U.S. Treasury and agencies
Maturing in one year or less$11 $11 0.14.64 %
Maturing after one year through five years14,070 13,335 3.22.63 
Maturing after five years through ten years15,629 14,476 6.53.35 
Maturing after ten years757 565 10.61.92 
Total$30,467 $28,387 5.12.98 %
Mortgage-backed securities(a)
Maturing in one year or less$30 $29 0.62.02 %
Maturing after one year through five years6,028 5,611 3.92.87 
Maturing after five years through ten years37,699 34,560 7.93.96 
Maturing after ten years481 438 11.04.76 
Total$44,238 $40,638 7.43.82 %
Asset-backed securities (a)
Maturing in one year or less$— $— — — %
Maturing after one year through five years3,668 3,684 1.74.90 
Maturing after five years through ten years3,468 3,481 5.96.26 
Maturing after ten years— — — — 
Total$7,136 $7,165 3.85.56 %
Obligations of state and political subdivisions(c)(d)
Maturing in one year or less$128 $128 0.45.53 %
Maturing after one year through five years1,698 1,687 2.54.67 
Maturing after five years through ten years1,563 1,474 7.23.69 
Maturing after ten years7,301 6,263 14.93.47 
Total$10,690 $9,552 11.73.72 %
Other
Maturing in one year or less$49 $49 0.74.66 %
Maturing after one year through five years200 201 1.74.82 
Maturing after five years through ten years— — — — 
Maturing after ten years— — — — 
Total$249 $250 1.54.79 %
Total available-for-sale(b)(f)
$92,780 $85,992 6.83.67 %
(a)Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities that take into account anticipated future prepayments.
(b)The weighted-average maturity of total held-to-maturity investment securities was 8.7 years at December 31, 2023, with a corresponding weighted-average yield of 2.22 percent. The weighted-average maturity of total available-for-sale investment securities was 6.3 years at December 31, 2023, with a corresponding weighted-average yield of 3.12 percent.
(c)Information related to obligations of state and political subdivisions is presented based upon yield to first optional call date if the security is purchased at a premium, and yield to maturity if the security is purchased at par or a discount.
(d)Maturity calculations for obligations of state and political subdivisions are based on the first optional call date for securities with a fair value above par and the contractual maturity date for securities with a fair value equal to or below par.
(e)Weighted-average yields for obligations of state and political subdivisions are presented on a fully-taxable equivalent basis based on a federal income tax rate of 21 percent. Yields on investment securities are computed based on amortized cost balances, excluding any premiums or discounts recorded related to the transfer of investment securities at fair value from available-for-sale to held-to maturity.
(f)Amortized cost excludes portfolio level basis adjustments of $13 million.