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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities
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, 2023 and 2022. Accrued interest receivable of $227 million and $215 million as of December 31, 2023 and 2022, respectively, is not included in the table below.
Table 2.1: Investment Securities Available for Sale
December 31, 2023
(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$5,330 $0 $1 $(49)$5,282 
RMBS:
Agency71,294 0 104 (8,450)62,948 
Non-agency610 (4)89 (5)690 
Total RMBS71,904 (4)193 (8,455)63,638 
Agency CMBS8,961 0 14 (652)8,323 
Other securities(1)
1,868 0 6 0 1,874 
Total investment securities available for sale$88,063 $(4)$214 $(9,156)$79,117 
 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 
__________    
(1)Includes $1.4 billion and $707 million of asset-backed securities (“ABS”) as of December 31, 2023 and 2022, respectively. The remaining amount is primarily comprised of supranational bonds and foreign government bonds.
Schedule of Available-for-Sale Securities in 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, 2023 and 2022. 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, 2023
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$733 $0 $2,242 $(49)$2,975 $(49)
RMBS:
Agency3,511 (43)53,987 (8,407)57,498 (8,450)
Non-agency1 0 13 (1)14 (1)
Total RMBS3,512 (43)54,000 (8,408)57,512 (8,451)
Agency CMBS547 (7)6,465 (645)7,012 (652)
Other securities276 0 4 0 280 0 
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(1)
$5,068 $(50)$62,711 $(9,102)$67,779 $(9,152)
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)
__________
(1)    Consists of approximately 2,740 and 2,840 securities in gross unrealized loss positions as of December 31, 2023 and 2022, respectively.
Schedule of Contractual Maturities for Securities
The table below summarizes, as of December 31, 2023, 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. Since 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, 2023
(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$1,927$3,355$0$0$5,282
RMBS(1):
Agency11071,12361,71762,948
Non-agency005685690
Total RMBS11071,12862,40263,638
Agency CMBS(1)
2592,6233,5021,9398,323
Other securities2821,5662601,874
Total securities available for sale$2,469$7,651$4,656$64,341$79,117
Amortized cost of securities available for sale$2,491$7,840$5,038$72,694$88,063
Weighted-average yield for securities available for sale3.71%4.04%3.45%2.92%3.08%
__________
(1)As of December 31, 2023, the weighted-average expected maturities of RMBS and Agency CMBS were 6.8 years and 4.6 years, respectively.
Schedule of Realized Gain (Loss)
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, 2023, 2022 and 2021.
 Year Ended December 31,
(Dollars in millions)202320222021
Realized gains (losses):
Gross realized gains$0 $1 $10 
Gross realized losses(34)(10)(8)
Net realized gains (losses)$(34)$(9)$2 
Total proceeds from sales$290 $2,570 $2,776