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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
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 March 31, 2022 and December 31, 2021. The amounts include securities available for sale without an allowance for credit losses.
Table 2.2: Securities in a Gross Unrealized Loss Position
March 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$3,960 $(29)$0 $0 $3,960 $(29)
RMBS:
Agency40,778 (2,263)17,358 (1,736)58,136 (3,999)
Non-agency14 0 0 0 14 0 
Total RMBS40,792 (2,263)17,358 (1,736)58,150 (3,999)
Agency CMBS5,106 (204)1,173 (100)6,279 (304)
Other securities(1)
1,524 (12)0 0 1,524 (12)
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(2)
$51,382 $(2,508)$18,531 $(1,836)$69,913 $(4,344)
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 securities(1)
1,207 (2)0 0 1,207 (2)
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(2)
$41,701 $(670)$9,410 $(326)$51,111 $(996)
__________
(1)    Includes primarily ABS, foreign government bonds, and supranational bonds.
(2)    Consists of approximately 1790 and 740 securities in gross unrealized loss positions as of March 31, 2022 and December 31, 2021, respectively.
Schedule of Contractual Maturities for Securities
The table below summarizes, as of March 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
March 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$5,338 $4,159 $0 $0 $9,497 
RMBS(1):
Agency0 124 1,070 66,330 67,524 
Non-agency0 0 0 901 901 
Total RMBS0 124 1,070 67,231 68,425 
Agency CMBS(1)
506 2,117 3,860 1,882 8,365 
Other securities291 2,195 303 0 2,789 
Total securities available for sale$6,135 $8,595 $5,233 $69,113 $89,076 
Amortized cost of securities available for sale$6,130 $8,694 $5,401 $72,748 $92,973 
Weighted-average yield for securities available for sale0.39 %0.89 %1.91 %1.96 %1.75 %
__________
(1)As of March 31, 2022, the weighted-average expected maturities of RMBS and Agency CMBS were 6.5 years and 5.4 years years, respectively.
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 March 31, 2022 and December 31, 2021. Accrued interest receivable of $219 million and $207 million as of March 31, 2022 and December 31, 2021, respectively, is not included in the table below.
Table 2.1: Investment Securities Available for Sale
March 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$9,521 $0 $5 $(29)$9,497 
RMBS:
Agency71,292 0 231 (3,999)67,524 
Non-agency728 (1)175 (1)901 
Total RMBS72,020 (1)406 (4,000)68,425 
Agency CMBS8,634 0 35 (304)8,365 
Other securities(1)
2,798 0 3 (12)2,789 
Total investment securities available for sale$92,973 $(1)$449 $(4,345)$89,076 
 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 $2.0 billion of asset-backed securities (“ABS”) as of both March 31, 2022 and December 31, 2021. The remaining amount is primarily comprised of supranational bonds and foreign government bonds.