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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
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 June 30, 2024 and December 31, 2023. Accrued interest receivable of $245 million and $227 million as of June 30, 2024 and December 31, 2023, respectively, is not included in the table below.
Table 3.1: Investment Securities Available for Sale
June 30, 2024
(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$6,053 $0 $2 $(26)$6,029 
RMBS:
Agency71,516 0 56 (9,756)61,816 
Non-agency589 (3)78 (6)658 
Total RMBS72,105 (3)134 (9,762)62,474 
Agency CMBS8,853 0 22 (675)8,200 
Other securities(1)
2,543 0 4 0 2,547 
Total investment securities available for sale$89,554 $(3)$162 $(10,463)$79,250 
 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 
__________    
(1)Includes $2.1 billion and $1.4 billion of asset-backed securities (“ABS”) as of June 30, 2024 and December 31, 2023, respectively. The remaining amount is primarily comprised of supranational bonds, foreign government bonds and U.S. agency debt 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 June 30, 2024 and December 31, 2023. The amounts include securities available for sale without an allowance for credit losses.
Table 3.2: Securities in a Gross Unrealized Loss Position
June 30, 2024
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$1,329 $(3)$2,014 $(23)$3,343 $(26)
RMBS:
Agency5,024 (42)53,037 (9,714)58,061 (9,756)
Non-agency4 0 12 (1)16 (1)
Total RMBS5,028 (42)53,049 (9,715)58,077 (9,757)
Agency CMBS632 (7)6,262 (668)6,894 (675)
Other securities713 0 96 0 809 0 
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(1)
$7,702 $(52)$61,421 $(10,406)$69,123 $(10,458)
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)
__________
(1)    Consists of approximately 2,790 and 2,740 securities in gross unrealized loss positions as of June 30, 2024 and December 31, 2023, respectively.
Schedule of Contractual Maturities for Securities
The table below summarizes, as of June 30, 2024, 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 3.3: Contractual Maturities and Weighted-Average Yields of Securities
June 30, 2024
(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$4,004$1,128$897$0$6,029
RMBS(1):
Agency2791,05860,67761,816
Non-agency008650658
Total RMBS2791,06661,32762,474
Agency CMBS(1)
5232,6433,0821,9528,200
Other securities2772,2502002,547
Total securities available for sale$4,806$6,100$5,065$63,279$79,250
Amortized cost of securities available for sale$4,825$6,277$5,441$73,011$89,554
Weighted-average yield for securities available for sale4.44%4.19%3.77%3.18%3.36%
__________
(1)As of June 30, 2024, the weighted-average expected maturities of RMBS and Agency CMBS were 7.9 years and 4.2 years, respectively.