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Debt Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Amortized Cost, Gross Unrealized Gains And Losses, And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity
NOTE 3. DEBT SECURITIES
The amortized 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:
 December 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$247 $— $(8)$239 $— $(16)$223 
Commercial agency516 — (1)515 — (22)493 
$763 $— $(9)$754 $— $(38)$716 
Debt securities available for sale:
U.S. Treasury securities$1,322 $— $(99)$1,223 $1,223 
Federal agency securities1,085 4 (46)1,043 1,043 
Obligations of states and political subdivisions2 — — 2 2 
Mortgage-backed securities:
Residential agency19,450 52 (2,130)17,372 17,372 
Commercial agency7,807 2 (502)7,307 7,307 
Commercial non-agency93 — (10)83 83 
Corporate and other debt securities1,105 4 (35)1,074 1,074 
$30,864 $62 $(2,822)$28,104 $28,104 
 
 
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 subdivisions2 — — 2 2 
Mortgage-backed securities:
Residential agency19,477 — (2,523)16,954 16,954 
Residential non-agency1 — — 1 1 
Commercial agency8,262 — (649)7,613 7,613 
Commercial non-agency198 — (12)186 186 
Corporate and other debt securities1,219 1 (66)1,154 1,154 
$31,367 $1 $(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.
Schedule Of Cost And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity By Contractual Maturity
The amortized cost and estimated fair value of debt securities held to maturity and debt securities available for sale at December 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$247 $223 
Commercial agency516 493 
$763 $716 
Debt securities available for sale:
Due in one year or less$369 $363 
Due after one year through five years2,600 2,455 
Due after five years through ten years390 384 
Due after ten years155 140 
Mortgage-backed securities:
Residential agency19,450 17,372 
Commercial agency7,807 7,307 
Commercial non-agency93 83 
$30,864 $28,104 
Schedule Of Gross Unrealized Losses And Estimated Fair Value Of Securities Available For Sale and Held To Maturity
The following tables present gross unrealized losses and the related estimated fair value of debt securities held to maturity and debt securities available for sale at December 31, 2023 and December 31, 2022. For debt securities transferred to held to maturity from available for sale, the analysis in the tables below compares the securities' original amortized cost to its current estimated fair value. All securities in an unrealized position are segregated between investments that have been in a continuous unrealized loss position for less than twelve months and for twelve months or more.
 December 31, 2023
 Less Than Twelve MonthsTwelve Months or MoreTotal
 Estimated
Fair
Value		Gross
Unrealized
Losses		Estimated
Fair
Value		Gross
Unrealized
Losses		Estimated
Fair
Value		Gross
Unrealized
Losses
 (In millions)
Debt securities held to maturity:
Mortgage-backed securities:
Residential agency$— $— $223 $(23)$223 $(23)
Commercial agency— — 493 (23)493 (23)
$— $— $716 $(46)$716 $(46)
Debt securities available for sale:
U.S Treasury securities$6 $— $1,201 $(99)$1,207 $(99)
Federal agency securities237 (5)666 (41)903 (46)
Mortgage-backed securities:
Residential agency241 (3)15,144 (2,127)15,385 (2,130)
Commercial agency612 (7)6,583 (495)7,195 (502)
Commercial non-agency— — 82 (10)82 (10)
Corporate and other debt securities23 — 879 (35)902 (35)
$1,119 $(15)$24,555 $(2,807)$25,674 $(2,822)
 
 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)$7 $(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)