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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021 and 2020. Accrued interest receivable of $207 million and $230 million as of December 31, 2021 and 2020, respectively, is not included in the table below. Table 2.1: Investment Securities Available for Sale
|  | 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: |  |  |  |  |  |  |  |  |  |
Agency |  | 72,593 |  |  | 0 |  |  | 958 |  |  | (931) |  |  | 72,620 |
Non-agency |  | 792 |  |  | (1) |  |  | 205 |  |  | 0 |  |  | 996 |
Total RMBS |  | 73,385 |  |  | (1) |  |  | 1,163 |  |  | (931) |  |  | 73,616 |
Agency CMBS |  | 9,237 |  |  | 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 |
|  | 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: |  |  |  |  |  |  |  |  |  |
Agency |  | 73,248 |  |  | 0 |  |  | 2,326 |  |  | (108) |  |  | 75,466 |
Non-agency |  | 1,035 |  |  | (1) |  |  | 204 |  |  | (1) |  |  | 1,237 |
Total RMBS |  | 74,283 |  |  | (1) |  |  | 2,530 |  |  | (109) |  |  | 76,703 |
Agency CMBS |  | 11,298 |  |  | 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 $2.0 billion and $1.8 billion of asset-backed securities (“ABS”) as of December 31, 2021, and 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 December 31, 2021 and 2020. 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, 2021
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
(Dollars in millions) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross 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-agency |  | 3 |  |  | 0 |  |  | 1 |  |  | 0 |  |  | 4 |  |  | 0 |
Total RMBS |  | 37,495 |  |  | (632) |  |  | 8,607 |  |  | (299) |  |  | 46,102 |  |  | (931) |
Agency CMBS |  | 2,999 |  |  | (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) |
|  | December 31, 2020
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
(Dollars in millions) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross 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-agency |  | 12 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 12 |  |  | 0 |
Total RMBS |  | 7,436 |  |  | (57) |  |  | 1,791 |  |  | (51) |  |  | 9,227 |  |  | (108) |
Agency CMBS |  | 1,545 |  |  | (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 ABS, foreign government bonds, and supranational bonds. (2) Consists of approxima tely 740 and 320 se cur ities in gross unrealized loss positions as of December 31, 2021 and 2020, respectively.
Schedule of Contractual Maturities for Securities | The table below summarizes, as of December 31, 2021, 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, 2021
(Dollars in millions) |  | Due in 1 Year or Less |  | Due > 1 Year through 5 Years |  | Due > 5 Years through 10 Years |  | Due > 10 Years |  | Total
Fair value of securities available for sale: |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 5,098 |  |  | $ | 4,344 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 9,442 |
RMBS(1): |  |  |  |  |  |  |  |  |  |
Agency |  | 0 |  |  | 132 |  |  | 1,124 |  |  | 71,364 |  |  | 72,620 |
Non-agency |  | 0 |  |  | 0 |  |  | 0 |  |  | 996 |  |  | 996 |
Total RMBS |  | 0 |  |  | 132 |  |  | 1,124 |  |  | 72,360 |  |  | 73,616 |
Agency CMBS(1) |  | 630 |  |  | 2,427 |  |  | 3,990 |  |  | 2,322 |  |  | 9,369 |
Other securities |  | 416 |  |  | 2,098 |  |  | 320 |  |  | 0 |  |  | 2,834 |
Total securities available for sale |  | $ | 6,144 |  |  | $ | 9,001 |  |  | $ | 5,434 |  |  | $ | 74,682 |  |  | $ | 95,261 |
Amortized cost of securities available for sale |  | $ | 6,140 |  |  | $ | 8,965 |  |  | $ | 5,342 |  |  | $ | 74,424 |  |  | $ | 94,871 |
Weighted-average yield for securities available for sale |  | 0.31 | % |  | 0.90 | % |  | 1.86 | % |  | 1.73 | % |  | 1.57 | %
__________ (1)As of December 31, 2021, the weighted-average expected maturities of RMBS and Agency CMBS were both 5.4 years.
Schedule of Realized Gain (Loss) | 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, 2021, 2020 and 2019. Table 2.4: Realized Gains and Losses on Securities
|  | Year Ended December 31,
(Dollars in millions) |  | 2021 |  | 2020 |  | 2019
Realized gains (losses): |  |  |  |  |  |
Gross realized gains |  | $ | 10 |  |  | $ | 25 |  |  | $ | 44 |
Gross realized losses |  | (8) |  |  | 0 |  |  | (18) |
Net realized gains |  | $ | 2 |  |  | $ | 25 |  |  | $ | 26 |
Total proceeds from sales |  | $ | 2,776 |  |  | $ | 812 |  |  | $ | 4,780 |

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