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Debt Securities
3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Securities mortized cost, gross unrealized gains and losses, and estimated fair value of debt securities held to maturity and debt securities available for sale are as follows:
 March 31, 2023
Recognized in OCI (1)
Not recognized in OCI
 Amortized
Cost
Gross Unrealized GainsGross Unrealized LossesCarrying ValueGross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$279 $— $(10)$269 $— $(16)$253 
Commercial agency522 — (1)521 — (25)496 
$801 $— $(11)$790 $— $(41)$749 
Debt securities available for sale:
U.S. Treasury securities$1,307 $— $(102)$1,205 $1,205 
Federal agency securities992 (49)946 946 
Obligations of states and political subdivisions— — 
Mortgage-backed securities:
Residential agency19,407 (2,245)17,165 17,165 
Commercial agency8,192 (537)7,657 7,657 
Commercial non-agency134 — (11)123 123 
Corporate and other debt securities1,180 (51)1,132 1,132 
$31,214 $11 $(2,995)$28,230 $28,230 
 
 
December 31, 2022
Recognized in OCI (1)
Not recognized in OCI
 Amortized
Cost
Gross Unrealized GainsGross Unrealized LossesCarrying ValueGross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$289 $— $(10)$279 $— $(21)$258 
Commercial agency523 — (1)522 — (29)493 
$812 $— $(11)$801 $— $(50)$751 
Debt securities available for sale:
U.S. Treasury securities$1,310 $— $(123)$1,187 $1,187 
Federal agency securities898 — (62)836 836 
Obligations of states and political subdivisions— — 
Mortgage-backed securities:
Residential agency19,477 — (2,523)16,954 16,954 
Residential non-agency— — 
Commercial agency8,262 — (649)7,613 7,613 
Commercial non-agency198 — (12)186 186 
Corporate and other debt securities1,219 (66)1,154 1,154 
$31,367 $$(3,435)$27,933 $27,933 
_________
(1)The gross unrealized losses recognized in OCI on securities held to maturity resulted from a transfer of securities available for sale to held to maturity in the second quarter of 2013.
Debt securities with carrying values of $11.9 billion and $8.8 billion at March 31, 2023 and December 31, 2022, respectively, were pledged to secure public funds, trust deposits and other borrowing arrangements.
The amortized cost and estimated fair value of debt securities held to maturity and debt securities available for sale at March 31, 2023, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
Amortized
Cost
Estimated
Fair Value
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$279 $253 
Commercial agency522 496 
$801 $749 
Debt securities available for sale:
Due in one year or less$183 $181 
Due after one year through five years2,290 2,172 
Due after five years through ten years843 782 
Due after ten years165 150 
Mortgage-backed securities:
Residential agency19,407 17,165 
Commercial agency8,192 7,657 
Commercial non-agency134 123 
$31,214 $28,230 
The following tables present gross unrealized losses and the related estimated fair value of debt securities held to maturity and debt securities available for sale at March 31, 2023 and December 31, 2022. For debt securities transferred to held to maturity from available for sale, the analysis in the tables below compares the securities' original amortized cost to its current estimated fair value. All securities in an unrealized position are segregated between investments that have been in a continuous unrealized loss position for less than twelve months and for twelve months or more.
 March 31, 2023
 Less Than Twelve MonthsTwelve Months or MoreTotal
 Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$— $— $253 $(25)$253 $(25)
Commercial agency457 (20)38 (6)495 (26)
$457 $(20)$291 $(31)$748 $(51)
Debt securities available for sale:
U.S Treasury securities$250 $(2)$950 $(100)$1,200 $(102)
Federal agency securities51 (1)650 (48)701 (49)
Mortgage-backed securities:
Residential agency2,189 (84)14,734 (2,161)16,923 (2,245)
Commercial agency3,533 (145)3,608 (392)7,141 (537)
Commercial non-agency58 (6)65 (5)123 (11)
Corporate and other debt securities363 (9)654 (42)1,017 (51)
$6,444 $(247)$20,661 $(2,748)$27,105 $(2,995)
 
 December 31, 2022
 Less Than Twelve MonthsTwelve Months or MoreTotal
 Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$251 $(29)$$(1)$258 $(30)
Commercial agency469 (26)24 (4)493 (30)
$720 $(55)$31 $(5)$751 $(60)
Debt securities available for sale:
U.S. Treasury securities$276 $(8)$903 $(115)$1,179 $(123)
Federal agency securities766 (50)53 (12)819 (62)
Mortgage-backed securities:
Residential agency9,350 (1,005)7,578 (1,518)16,928 (2,523)
Commercial agency6,110 (400)1,503 (249)7,613 (649)
Commercial non-agency141 (8)45 (4)186 (12)
Corporate and other debt securities736 (36)354 (30)1,090 (66)
$17,379 $(1,507)$10,436 $(1,928)$27,815 $(3,435)
The number of individual debt positions in an unrealized loss position in the tables above decreased from 1,806 at December 31, 2022 to 1,763 at March 31, 2023. The decrease in the number of securities and the total amount of unrealized losses from year-end 2022 was primarily due to changes in market interest rates. In instances where an unrealized loss existed, there was no indication of an adverse change in credit on the underlying positions in the tables above. As it relates to these positions, management believes no individual unrealized loss represented credit impairment as of those dates. The Company does not intend to sell, and it is not more likely than not that the Company will be required to sell, the positions before the recovery of their amortized cost basis, which may be at maturity.
Gross realized gains and gross realized losses on sales of debt securities available for sale were immaterial for the three months ended March 31, 2023. The cost of securities sold is based on the specific identification method. As part of the Company's normal process for evaluating impairment, management did not identify any positions where impairment was believed to exist in either of the three months ended March 31, 2023 or 2022.