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INVESTMENT SECURITIES AND OTHER SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses by Investment Category The following tables provide amortized cost, fair value, and gross unrealized gains and losses by investment category.
Unrealized
(dollar amounts in millions)
Amortized
Cost (1)(2)
Gross
Gains		Gross
Losses		Fair Value
At September 30, 2024
Available-for-sale securities:
U.S. Treasury$6,508 $24 $(2)$6,530 
Federal agencies:
Residential CMO3,363 — (341)3,022 
Residential MBS12,277 5 (1,497)10,785 
Commercial MBS2,521 — (651)1,870 
Other agencies140 — (4)136 
Total U.S. Treasury, federal agency, and other agency securities
24,809 29 (2,495)22,343 
Municipal securities3,756 4 (112)3,648 
Private-label CMO122 — (8)114 
Asset-backed securities323 — (17)306 
Corporate debt2,179 62 (170)2,071 
Other securities/sovereign debt
10 — — 10 
Total available-for-sale securities$31,199 $95 $(2,802)$28,492 
Held-to-maturity securities:
U.S. Treasury$996 $2 $(1)$997 
Federal agencies:
Residential CMO4,429 11 (570)3,870 
Residential MBS8,735 1 (983)7,753 
Commercial MBS1,428 — (192)1,236 
Other agencies80 — (4)76 
Total federal agency and other agency securities15,668 14 (1,750)13,932 
Municipal securities2 — (1)1 
Total held-to-maturity securities$15,670 $14 $(1,751)$13,933 
Other securities, at cost:
Non-marketable equity securities:
Federal Home Loan Bank stock$249 $— $— $249 
Federal Reserve Bank stock520 — — 520 
Other non-marketable equity securities
25 — — 25 
Other securities, at fair value:
Mutual funds31 — — 31 
Equity securities1 — — 1 
Total other securities$826 $— $— $826 
(1)Amortized cost amounts exclude accrued interest receivable, which is recorded within accrued income and other receivables on the Unaudited Consolidated Balance Sheets. At September 30, 2024, accrued interest receivable on available-for-sale securities and held-to-maturity securities totaled $88 million and $38 million, respectively.
(2)Excluded from the amortized cost are portfolio level basis adjustments for securities designated in fair value hedges under the portfolio layer method. The basis adjustments totaled $377 million and represent a reduction to the amortized cost of the securities being hedged. The securities being hedged under the portfolio layer method are primarily Residential CMO and Residential MBS securities.
Unrealized
(dollar amounts in millions)Amortized
Cost (1)(2)		Gross
Gains		Gross
Losses		Fair Value
At December 31, 2023
Available-for-sale securities:
U.S. Treasury$2,855 $1 $— $2,856 
Federal agencies:
Residential CMO3,592 — (408)3,184 
Residential MBS13,155 3 (1,776)11,382 
Commercial MBS2,536 — (709)1,827 
Other agencies161 — (6)155 
Total U.S. Treasury, federal agency, and other agency securities22,299 4 (2,899)19,404 
Municipal securities3,536 2 (165)3,373 
Private-label CMO131 — (12)119 
Asset-backed securities387 — (31)356 
Corporate debt2,202 79 (238)2,043 
Other securities/sovereign debt
10 — — 10 
Total available-for-sale securities$28,565 $85 $(3,345)$25,305 
Held-to-maturity securities:
Federal agencies:
Residential CMO4,770 6 (664)4,112 
Residential MBS9,368 1 (1,145)8,224 
Commercial MBS1,509 — (224)1,285 
Other agencies101 — (6)95 
Total U.S. Treasury, federal agency, and other agency securities15,748 7 (2,039)13,716 
Municipal securities2 — — 2 
Total held-to-maturity securities$15,750 $7 $(2,039)$13,718 
Other securities, at cost:
Non-marketable equity securities:
Federal Home Loan Bank stock$169 $— $— $169 
Federal Reserve Bank stock507 — — 507 
Other non-marketable equity securities17 — — 17 
Other securities, at fair value:
Mutual funds30 — — 30 
Equity securities1 1 — 2 
Total other securities$724 $1 $— $725 
(1)Amortized cost amounts exclude accrued interest receivable, which is recorded within accrued income and other receivables on the Unaudited Consolidated Balance Sheets. At December 31, 2023, accrued interest receivable on available-for-sale securities and held-to-maturity securities totaled $61 million and $36 million, respectively.
(2)Excluded from the amortized cost are portfolio level basis adjustments for securities designated in fair value hedges under the portfolio layer method. The basis adjustments totaled $619 million and represent a reduction to the amortized cost of the securities being hedged. The securities being hedged under the portfolio layer method are primarily Residential CMO and Residential MBS securities.
Investments by Contractual Maturity The following table provides the amortized cost and fair value of securities by contractual maturity. Expected maturities may differ from contractual maturities as issuers may have the right to call or prepay obligations with or without incurring penalties.
At September 30, 2024At December 31, 2023
(dollar amounts in millions)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Available-for-sale securities:
Under 1 year$4,936 $4,939 $3,380 $3,372 
After 1 year through 5 years4,817 4,717 2,484 2,338 
After 5 years through 10 years2,392 2,286 2,392 2,255 
After 10 years19,054 16,550 20,309 17,340 
Total available-for-sale securities$31,199 $28,492 $28,565 $25,305 
Held-to-maturity securities:
Under 1 year$245 $245 $1 $1 
After 1 year through 5 years784 784 48 46 
After 5 years through 10 years63 60 69 66 
After 10 years14,578 12,844 15,632 13,605 
Total held-to-maturity securities$15,670 $13,933 $15,750 $13,718 
Investments with Unrealized Losses by Investment Category
The following tables provide detail on investment securities with unrealized losses aggregated by investment category and the length of time the individual securities have been in a continuous loss position.
Less than 12 MonthsOver 12 MonthsTotal
(dollar amounts in millions)Fair
Value		Gross Unrealized
Losses		Fair
Value		Gross Unrealized
Losses		Fair
Value		Gross Unrealized
Losses
At September 30, 2024
Available-for-sale securities:
U.S. Treasury$885 $(2)$— $— $885 $(2)
Federal agencies:
Residential CMO— — 2,977 (341)2,977 (341)
Residential MBS— — 10,422 (1,497)10,422 (1,497)
Commercial MBS— — 1,870 (651)1,870 (651)
Other agencies— — 71 (4)71 (4)
Total U.S. Treasury, federal agency, and other agency securities885 (2)15,340 (2,493)16,225 (2,495)
Municipal securities504 (7)2,536 (105)3,040 (112)
Private-label CMO— — 92 (8)92 (8)
Asset-backed securities— — 272 (17)272 (17)
Corporate debt— — 2,071 (170)2,071 (170)
Total temporarily impaired available-for-sale securities$1,389 $(9)$20,311 $(2,793)$21,700 $(2,802)
Held-to-maturity securities:
U.S. Treasury$554 $(1)$— $— $554 $(1)
Federal agencies:
Residential CMO— — 3,366 (570)3,366 (570)
Residential MBS— — 7,646 (983)7,646 (983)
Commercial MBS— — 1,236 (192)1,236 (192)
Other agencies— — 76 (4)76 (4)
Total U.S. Treasury, federal agency, and other agency securities554 (1)12,324 (1,749)12,878 (1,750)
Municipal securities— — 1 (1)1 (1)
Total temporarily impaired held-to-maturity securities$554 $(1)$12,325 $(1,750)$12,879 $(1,751)
Less than 12 MonthsOver 12 MonthsTotal
(dollar amounts in millions)Fair
Value		Gross Unrealized
Losses		Fair
Value		Gross Unrealized
Losses		Fair
Value		Gross Unrealized
Losses
At December 31, 2023
Available-for-sale securities:
Federal agencies:
Residential CMO$543 $(7)$2,641 $(401)$3,184 $(408)
Residential MBS207 (2)10,913 (1,774)11,120 (1,776)
Commercial MBS— — 1,827 (709)1,827 (709)
Other agencies— — 81 (6)81 (6)
Total federal agency and other agency securities750 (9)15,462 (2,890)16,212 (2,899)
Municipal securities625 (19)2,496 (146)3,121 (165)
Private-label CMO— — 99 (12)99 (12)
Asset-backed securities— — 281 (31)281 (31)
Corporate debt— — 2,043 (238)2,043 (238)
Total temporarily impaired available-for-sale securities$1,375 $(28)$20,381 $(3,317)$21,756 $(3,345)
Held-to-maturity securities:
Federal agencies:
Residential CMO$156 $(1)$3,542 $(663)$3,698 $(664)
Residential MBS— — 8,108 (1,145)8,108 (1,145)
Commercial MBS— — 1,285 (224)1,285 (224)
Other agencies— — 95 (6)95 (6)
Total federal agency and other agency securities156 (1)13,030 (2,038)13,186 (2,039)
Total temporarily impaired held-to-maturity securities$156 $(1)$13,030 $(2,038)$13,186 $(2,039)