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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities
The table below presents the amortized cost, gross unrealized gains and losses, and fair value of securities available for sale as of September 30, 2021 and December 31, 2020. Accrued interest receivable of $227 million and $230 million as of September 30, 2021, and December 31, 2020, respectively, is not included in the table below.
Table 2.1: Investment Securities Available for Sale
September 30, 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$9,094 $0 $15 $0 $9,109 
RMBS:
Agency73,924 0 1,325 (617)74,632 
Non-agency844 (1)206 0 1,049 
Total RMBS74,768 (1)1,531 (617)75,681 
Agency CMBS9,973 0 265 (41)10,197 
Other securities(1)
3,154 0 8 0 3,162 
Total investment securities available for sale$96,989 $(1)$1,819 $(658)$98,149 
 December 31, 2020
(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$9,302 $0 $16 $0 $9,318 
RMBS:
Agency73,248 0 2,326 (108)75,466 
Non-agency1,035 (1)204 (1)1,237 
Total RMBS74,283 (1)2,530 (109)76,703 
Agency CMBS11,298 0 448 (11)11,735 
Other securities(1)
2,686 0 3 0 2,689 
Total investment securities available for sale$97,569 $(1)$2,997 $(120)$100,445 
__________    
(1)Includes $2.3 billion and $1.8 billion of asset-backed securities (“ABS”) as of September 30, 2021, and December 31, 2020, 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 September 30, 2021 and December 31, 2020. The amounts include securities available for sale without an allowance for credit losses.
Table 2.2: Securities in a Gross Unrealized Loss Position
September 30, 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$35,415 $(519)$4,068 $(98)$39,483 $(617)
Non-agency0 0 1 0 1 0 
Total RMBS35,415 (519)4,069 (98)39,484 (617)
Agency CMBS1,746 (26)561 (15)2,307 (41)
Other securities(1)
470 0 0 0 470 0 
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(2)
$37,631 $(545)$4,630 $(113)$42,261 $(658)

December 31, 2020
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$7,424 $(57)$1,791 $(51)$9,215 $(108)
Non-agency12 0 0 0 12 0 
Total RMBS7,436 (57)1,791 (51)9,227 (108)
Agency CMBS1,545 (7)267 (4)1,812 (11)
Other securities(1)
114 0 1 0 115 0 
Total investment securities available for sale in a gross unrealized loss position without an allowance for credit losses(2)
$9,095 $(64)$2,059 $(55)$11,154 $(119)
__________
(1)    Includes primarily other asset-backed securities, foreign government bonds, and supranational bonds.
(2)    Consists of approximately 540 and 320 securities in gross unrealized loss positions as of September 30, 2021 and December 31, 2020, respectively.
Schedule of Contractual Maturities for Securities
The table below summarizes, by major security type, the contractual maturities and weighted-average yields of our investment securities as of September 30, 2021. 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
September 30, 2021
(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$5,203 $3,906 $0 $0 $9,109 
RMBS(1):
Agency0 137 1,106 73,389 74,632 
Non-agency0 0 0 1,049 1,049 
Total RMBS0 137 1,106 74,438 75,681 
Agency CMBS(1)
570 2,489 4,462 2,676 10,197 
Other securities252 2,585 325 0 3,162 
Total securities available for sale$6,025 $9,117 $5,893 $77,114 $98,149 
Amortized cost of securities available for sale$6,019 $9,062 $5,761 $76,147 $96,989 
Weighted-average yield for securities available for sale0.31 %0.72 %1.66 %1.71 %1.53 %
__________
(1)As of September 30, 2021, the weighted-average expected maturities of RMBS and Agency CMBS were 5.3 years and 5.5 years, respectively.