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Investments (Tables)
 3 Months Ended
Mar. 31, 2024
Investments [Abstract]  
Summary of Investment Securities The following schedule presents the amortized cost and estimated fair values of our HTM and AFS securities:
March 31, 2024
(In millions)Amortized
cost
Gross unrealized gains 1
Gross unrealized lossesEstimated
fair value
Held-to-maturity
U.S. Government agencies and corporations:
Agency securities$92 $— $7 $85 
Agency guaranteed mortgage-backed securities9,776 17 97 9,696 
Municipal securities341 — 17 324 
Total held-to-maturity10,209 17 121 10,105 
Available-for-sale
U.S. Treasury securities584 — 103 481 
U.S. Government agencies and corporations:
Agency securities629 — 33 596 
Agency guaranteed mortgage-backed securities8,335 — 1,282 7,053 
Small Business Administration loan-backed securities543 — 25 518 
Municipal securities1,336 — 77 1,259 
Other debt securities25 — 1 24 
Total available-for-sale11,452 — 1,521 9,931 
Total HTM and AFS investment securities$21,661 $17 $1,642 $20,036 
December 31, 2023
(In millions)Amortized
cost
Gross unrealized gains 1
Gross unrealized lossesEstimated
fair value
Held-to-maturity
U.S. Government agencies and corporations:
Agency securities$93 $— $6 $87 
Agency guaranteed mortgage-backed securities9,935 156 50 10,041 
Municipal securities354 — 16 338 
Total held-to-maturity10,382 156 72 10,466 
Available-for-sale
U.S. Treasury securities585 — 93 492 
U.S. Government agencies and corporations:
Agency securities663 — 33 630 
Agency guaranteed mortgage-backed securities8,530 — 1,239 7,291 
Small Business Administration loan-backed securities571 — 25 546 
Municipal securities1,385 — 67 1,318 
Other debt securities25 — 2 23 
Total available-for-sale11,759 — 1,459 10,300 
Total HTM and AFS investment securities$22,141 $156 $1,531 $20,766 
1 Gross unrealized gains for the respective AFS security categories were individually less than $1 million.
Contractual Maturities Debt Securities
The following schedule presents the amortized cost and weighted average yields of debt securities by contractual maturity of principal payments at March 31, 2024. This schedule does not reflect the duration of the portfolio, which would incorporate amortization, expected prepayments, interest rate resets, and fair value hedges; the effects of which result in measured durations shorter than contractual maturities.
March 31, 2024
Total
debt securities		Due in one year or lessDue after one year through five yearsDue after five years through ten yearsDue after ten years
(Dollar amounts in millions)Amortized costAverage yieldAmortized costAverage yieldAmortized costAverage yieldAmortized costAverage yieldAmortized costAverage yield
Held-to-maturity
U.S. Government agencies and corporations:
Agency securities$92 3.52 %$— — %$— — %$— — %$92 3.52 %
Agency guaranteed mortgage-backed securities
9,776 1.85 — — — — 44 1.93 9,732 1.85 
Municipal securities 1
341 3.19 30 2.86 129 2.91 154 3.49 28 3.17 
Total held-to-maturity securities10,209 1.91 30 2.86 129 2.91 198 3.14 9,852 1.87 
Available-for-sale
U.S. Treasury securities584 3.25 183 5.22 — — — — 401 2.35 
U.S. Government agencies and corporations:
Agency securities629 2.59 142 1.55 122 2.74 202 2.84 163 3.09 
Agency guaranteed mortgage-backed securities8,335 2.02 5 1.28 150 1.70 1,412 2.12 6,768 2.01 
Small Business Administration loan-backed securities543 5.53 1 4.92 20 6.33 138 4.43 384 5.88 
Municipal securities 1
1,336 2.18 147 2.72 408 2.56 713 1.85 68 2.30 
Other debt securities25 8.78 — — 10 9.52 — — 15 8.29 
Total available-for-sale securities
11,452 2.32 478 3.32 710 2.61 2,465 2.23 7,799 2.26 
Total HTM and AFS investment securities$21,661 2.12 %$508 3.29 %$839 2.66 %$2,663 2.30 %$17,651 2.04 %
1 The yields on tax-exempt securities are calculated on a tax-equivalent basis.
Summary of Amount of Gross Unrealized Losses for Debt Securities and Estimated Fair Value
The following schedule presents gross unrealized losses for AFS securities and the estimated fair value by length of time the securities have been in an unrealized loss position:
March 31, 2024
Less than 12 months12 months or moreTotal
(In millions)Gross
unrealized
losses		Estimated
fair
value		Gross
unrealized
losses		Estimated
fair
value		Gross
unrealized
losses		Estimated
fair
value
Available-for-sale
U.S. Treasury securities$— $10 $103 $298 $103 $308 
U.S. Government agencies and corporations:
Agency securities— — 33 579 33 579 
Agency guaranteed mortgage-backed securities73 312 1,209 6,665 1,282 6,977 
Small Business Administration loan-backed securities— 3 25 460 25 463 
Municipal securities1 83 76 1,154 77 1,237 
Other— — 1 14 1 14 
Total available-for-sale investment securities$74 $408 $1,447 $9,170 $1,521 $9,578 
December 31, 2023
Less than 12 months12 months or moreTotal
(In millions)Gross
unrealized
losses		Estimated
 fair
 value		Gross
unrealized
losses		Estimated
 fair
 value		Gross
unrealized
losses		Estimated
 fair
 value
Available-for-sale
U.S. Treasury securities$— $— $93 $308 $93 $308 
U.S. Government agencies and corporations:
Agency securities— 5 33 605 33 610 
Agency guaranteed mortgage-backed securities71 312 1,168 6,902 1,239 7,214 
Small Business Administration loan-backed securities— 4 25 484 25 488 
Municipal securities2 229 65 1,061 67 1,290 
Other— — 2 13 2 13 
Total available-for-sale investment securities$73 $550 $1,386 $9,373 $1,459 $9,923 
Gains and Losses, Including OTTI, Recognized in Statement of Income
The following schedule presents securities gains and losses recognized in income:
Three Months Ended March 31,
20242023
(In millions)Gross gainsGross lossesGross gainsGross losses
Available-for-sale$— $— $1 $1 
Trading10 9 3 3 
Other noninterest-bearing investments6 9 4 3 
Total gains16 18 8 7 
Net gains (losses) 1
$(2)$1 
1 Net gains (losses) were recognized in “Securities gains (losses), net” on the consolidated statement of income.
Interest Income by Security Type
The following schedule presents interest income by security type:
Three Months Ended March 31,
20242023
(In millions)TaxableNontaxableTotalTaxableNontaxableTotal
Investment securities:
Held-to-maturity$56 $1 $57 $60 $1 $61 
Available-for-sale77 8 85 69 6 75 
Trading— — — 1 — 1 
Total securities$133 $9 $142 $130 $7 $137