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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Summary
The following table summarizes our available for sale and held to maturity portfolios by major security type:
Table 35: Investment Securities Summary (a)(b)
December 31, 2023December 31, 2022
In millionsAmortized
Cost (c)		UnrealizedFair
Value		Amortized
Cost (c)		UnrealizedFair
Value
GainsLossesGainsLosses
Securities Available for Sale
U.S. Treasury and government agencies$7,596 $22 $(667)$6,951 $9,196 $10 $(836)$8,370 
Residential mortgage-backed
Agency30,643 46 (2,809)27,880 32,114 13 (3,304)28,823 
Non-agency585 118 (7)696 697 131 (9)819 
Commercial mortgage-backed
Agency1,680 1 (135)1,546 1,845 (170)1,675 
Non-agency913 1 (45)869 1,325 (69)1,256 
Asset-backed1,092 25 (1)1,116 103 27 (1)129 
Other2,844 44 (161)2,727 3,288 44 (245)3,087 
Total securities available for sale $45,353 $257 $(3,825)$41,785 $48,568 $225 $(4,634)$44,159 
Securities Held to Maturity
U.S. Treasury and government agencies$36,529 $9 $(1,141)$35,397 $36,571 $6 $(1,617)$34,960 
Residential mortgage-backed
Agency42,686 92 (2,733)40,045 45,271 74 (3,095)42,250 
Non-agency259  (17)242 276 (21)255 
Commercial mortgage-backed
Agency939 9 (23)925 848 4 (26)826 
Non-agency1,373 2 (27)1,348 1,667 (40)1,627 
Asset-backed5,890 17 (39)5,868 7,188 6 (140)7,054 
Other3,108 50 (35)3,123 3,354 25 (72)3,307 
Total securities held to maturity (d)$90,784 $179 $(4,015)$86,948 $95,175 $115 $(5,011)$90,279 
(a) At December 31, 2023, the accrued interest associated with our held to maturity and available for sale portfolios totaled $281 million and $144 million, respectively. The comparable amounts at December 31, 2022 were $282 million and $144 million, respectively. These amounts are included in Other assets on the Consolidated Balance Sheet.
(b) Credit ratings represent a primary credit quality indicator used to monitor and manage credit risk. Of our total securities portfolio, 97% were rated AAA/AA at both December 31, 2023 and 2022.
(c) Amortized cost is presented net of allowance of $86 million for securities available for sale, primarily related to non-agency commercial mortgage-backed securities and $6 million for securities held to maturity at December 31, 2023. The comparable amounts at December 31, 2022 were $142 million and $7 million, respectively.
(d) Held to maturity securities transferred from available for sale are included in held to maturity at fair value at the time of the transfer. The amortized cost of held to maturity securities included net unrealized losses of $4.2 billion at December 31, 2023, related to securities transferred, which are offset in AOCI, net of tax. The comparable amount at December 31, 2022 was $5.1 billion.
Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses
Table 36: Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses
Unrealized loss position
less than 12 months		Unrealized loss position
12 months or more		Total
In millionsUnrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value
December 31, 2023
U.S. Treasury and government agencies  $(666)$6,035 $(666)$6,035 
Residential mortgage-backed
Agency$(4)$1,015 (2,805)24,306 (2,809)25,321 
Non-agency(1)15 (4)84 (5)99 
Commercial mortgage-backed
Agency  (135)1,495 (135)1,495 
Non-agency(45)731 (45)731 
Asset-backed  (1)9 (1)9 
Other(3)78 (136)2,106 (139)2,184 
Total securities available for sale$(8)$1,108 $(3,792)$34,766 $(3,800)$35,874 
December 31, 2022
U.S. Treasury and government agencies$(601)$5,868 $(235)$2,208 $(836)$8,076 
Residential mortgage-backed
Agency(1,744)19,036 (1,560)8,971 (3,304)28,007 
Non-agency(6)112 (2)17 (8)129 
Commercial mortgage-backed
Agency(125)1,283 (45)372 (170)1,655 
Non-agency(44)750 (18)394 (62)1,144 
Asset-backed(1)5 (1)5 
Other(96)1,418 (112)1,144 (208)2,562 
Total securities available for sale$(2,616)$28,467 $(1,973)$13,111 $(4,589)$41,578 
Gains (losses) on Sales Of Securities Available for Sale
Information related to gross realized securities gains and losses from the sales of securities is set forth in the following table:

Table 37: Gains (Losses) on Sales of Securities Available for Sale
Year ended December 31
In millions		Gross GainsGross LossesNet Gains (Losses)Tax Expense (Benefit)
2023 $(2)$(2) 
2022$11 $(18)$(7)$(1)
2021$360 $(296)$64 $13 
Contractual Maturity of Securities
The following table presents, by remaining contractual maturity, the amortized cost, fair value and weighted-average yield of debt securities at December 31, 2023:
Table 38: Contractual Maturity of Debt Securities
1 Year or
Less		After 1 Year
through 5 Years		After 5 Years
through 10 Years		After 10
Years		Total
Dollars in millions
Securities Available for Sale
U.S. Treasury and government agencies$2,055 $2,968 $461 $2,112 $7,596 
Residential mortgage-backed
Agency1 210 3,766 26,666 30,643 
Non-agency12 573 585 
Commercial mortgage-backed
Agency31 576 718 355 1,680 
Non-agency1 106 118 688 913 
Asset-backed 273 171 648 1,092 
Other279 2,093 321 151 2,844 
Total securities available for sale at amortized cost$2,367 $6,226 $5,567 $31,193 $45,353 
Fair value$2,309 $5,822 $5,265 $28,389 $41,785 
Weighted-average yield, GAAP basis (a)0.99 %2.32 %2.94 %3.12 %2.88 %
Securities Held to Maturity
U.S. Treasury and government agencies$8,177 $25,744 $1,711 $897 $36,529 
Residential mortgage-backed
Agency10 329 42,347 42,686 
Non-agency259 259 
Commercial mortgage-backed
Agency151 518 270 939 
Non-agency29 50 1,294 1,373 
Asset-backed2 1,689 2,269 1,930 5,890 
Other221 1,025 552 1,310 3,108 
Total securities held to maturity at amortized cost$8,429 $28,669 $5,379 $48,307 $90,784 
Fair value$8,299 $27,830 $5,232 $45,587 $86,948 
Weighted-average yield, GAAP basis (a)0.85 %1.55 %4.20 %2.92 %2.37 %
(a)        Weighted-average yields are based on amortized cost with effective yields weighted for the contractual maturity of each security. Actual maturities and yields may differ as certain securities may be prepaid.
Fair Value of Securities Pledged and Accepted as Collateral
The following table presents the fair value of securities that have been either pledged to or accepted from others to collateralize outstanding borrowings:
Table 39: Fair Value of Securities Pledged and Accepted as Collateral
In millionsDecember 31
2023		December 31
2022
Pledged to others$29,878 $24,708 
Accepted from others:
Permitted by contract or custom to sell or repledge $755 $1,266 
Permitted amount repledged to others$755 $1,266