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Investment Securities
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Investment Securities
NOTE 2—INVESTMENT SECURITIES
Our investment securities portfolio consists of the following: U.S. government-sponsored enterprise or agency (“Agency”) and non-agency residential mortgage-backed securities (“RMBS”), agency commercial mortgage-backed securities (“CMBS”), U.S. Treasury securities and other securities. Agency securities include Government National Mortgage Association (“Ginnie Mae”) guaranteed securities, Federal National Mortgage Association (“Fannie Mae”) and Federal Home Loan Mortgage Corporation (“Freddie Mac”) issued securities. The carrying value of our investments in Agency and U.S. Treasury securities represented 97% and 96% of our total investment securities portfolio as of December 31, 2022 and 2021, respectively.
The table below presents the amortized cost, allowance for credit losses, gross unrealized gains and losses, and fair value aggregated by major security type as of December 31, 2022 and 2021. Accrued interest receivable of $215 million and $207 million as of December 31, 2022 and 2021, respectively, is not included in the table below.
Table 2.1: Investment Securities Available for Sale
December 31, 2022
(Dollars in millions)Amortized
Cost		Allowance
 for Credit
 Losses		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Investment securities available for sale:
U.S. Treasury securities$5,129 $0 $2 $(90)$5,041 
RMBS:
Agency71,212 0 53 (9,413)61,852 
Non-agency653 (3)93 (6)737 
Total RMBS71,865 (3)146 (9,419)62,589 
Agency CMBS8,626 0 4 (760)7,870 
Other securities(1)
1,427 0 2 (10)1,419 
Total investment securities available for sale$87,047 $(3)$154 $(10,279)$76,919 
 December 31, 2021
(Dollars in millions)Amortized
Cost		Allowance
 for Credit
 Losses		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Investment securities available for sale:
U.S. Treasury securities$9,419 $0 $23 $0 $9,442 
RMBS:
Agency72,593 0 958 (931)72,620 
Non-agency792 (1)205 0 996 
Total RMBS73,385 (1)1,163 (931)73,616 
Agency CMBS9,237 0 195 (63)9,369 
Other securities(1)
2,830 0 6 (2)2,834 
Total investment securities available for sale$94,871 $(1)$1,387 $(996)$95,261 
__________    
(1)Includes $707 million and $2.0 billion of asset-backed securities (“ABS”) as of December 31, 2022 and 2021, respectively. The remaining amount is primarily comprised of supranational bonds and foreign government bonds.
Investment Securities in a Gross Unrealized Loss Position
The table below provides the gross unrealized losses and fair value of our securities available for sale aggregated by major security type and the length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2022 and 2021. The amounts include securities available for sale without an allowance for credit losses.
Table 2.2: Securities in a Gross Unrealized Loss Position
December 31, 2022
Less than 12 Months12 Months or LongerTotal
(Dollars in millions)Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Investment securities available for sale without an allowance for credit losses:
U.S. Treasury securities$2,464 $(57)$448 $(33)$2,912 $(90)
RMBS:
Agency23,271 (1,809)36,803 (7,604)60,074 (9,413)
Non-agency14 (1)3 0 17 (1)
Total RMBS23,285 (1,810)36,806 (7,604)60,091 (9,414)
Agency CMBS4,325 (267)3,214 (493)7,539 (760)
Other securities555 (7)76 (3)631 (10)
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(1)
$30,629 $(2,141)$40,544 $(8,133)$71,173 $(10,274)
December 31, 2021
Less than 12 Months12 Months or LongerTotal
(Dollars in millions)Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses		Fair ValueGross
Unrealized
Losses
Investment securities available for sale without an allowance for credit losses:
RMBS:
Agency$37,492 $(632)$8,606 $(299)$46,098 $(931)
Non-agency3 0 1 0 4 0 
Total RMBS37,495 (632)8,607 (299)46,102 (931)
Agency CMBS2,999 (36)803 (27)3,802 (63)
Other securities1,207 (2)0 0 1,207 (2)
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(1)
$41,701 $(670)$9,410 $(326)$51,111 $(996)
__________
(1)    Consists of approximately 2,840 and 740 securities in gross unrealized loss positions as of December 31, 2022 and 2021, respectively.
Maturities and Yields of Investment Securities
The table below summarizes, as of December 31, 2022, the fair value of our investment securities by major security type and contractual maturity as well as the total fair value, amortized cost and weighted-average yields of our investment securities by contractual maturity. Because borrowers may have the right to call or prepay certain obligations, the expected maturities of our securities are likely to differ from the scheduled contractual maturities presented below. The weighted-average yield below represents the effective yield for the investment securities and is calculated based on the amortized cost of each security.
Table 2.3: Contractual Maturities and Weighted-Average Yields of Securities
December 31, 2022
(Dollars in millions)Due in
1 Year or Less		Due > 1 Year
through
5 Years		Due > 5 Years
through
10 Years		Due > 10 YearsTotal
Fair value of securities available for sale:
U.S. Treasury securities$0$5,041$0$0$5,041
RMBS(1):
Agency01031,15160,59861,852
Non-agency000737737
Total RMBS01031,15161,33562,589
Agency CMBS(1)
2962,1253,5831,8667,870
Other securities4249653001,419
Total securities available for sale$720$8,234$4,764$63,201$76,919
Amortized cost of securities available for sale$726$8,492$5,281$72,548$87,047
Weighted-average yield for securities available for sale3.54%2.12%2.54%2.35%2.34%
__________
(1)As of December 31, 2022, the weighted-average expected maturities of RMBS and Agency CMBS were 7.1 years and 5.0 years, respectively.
Table 2.4 Net Securities Gains or Losses and Proceeds from Sales
The following table presents the gross realized gains or losses and proceeds from the sale of securities available for sale for the years ended December 31, 2022, 2021 and 2020.
 Year Ended December 31,
(Dollars in millions)202220212020
Realized gains (losses):
Gross realized gains$1 $10 $25 
Gross realized losses(10)(8)0 
Net realized gains (losses)$(9)$2 $25 
Total proceeds from sales$2,570 $2,776 $812 
Securities Pledged and Received
We pledged investment securities totaling $21.3 billion and $20.8 billion as of December 31, 2022 and 2021, respectively. These securities are primarily pledged to secure Public Fund Deposits and FHLB advances, as well as for other purposes as required or permitted by law. We accepted pledges of securities with a fair value of approximately $82 million and $1 million as of December 31, 2022 and 2021, respectively, related to our derivative transactions.