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Investment Securities (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest available-for-sale debt securities | $ 38 | $ 26 |
Available-for-sale debt securities: |  |  |
Cost | 9,442 |  |
Estimated Fair Value | 9,487 |  |
Equity securities |  |  |
Cost | 58 | 56 |
Gross Unrealized Gains | 46 | 27 | $ 5
Gross Unrealized Losses | (2) | (2) |
Estimated Fair Value | 102 | 81 |
Total Cost | 9,500 | 21,521 |
Total Gross Unrealized Gains | 92 | 112 |
Total Gross Unrealized Losses | (3) | (2) |
Total Estimated Fair Value | 9,589 | 21,631 |
Investment Securities |  |  |
Equity securities |  |  |
Cost | 7 |  |
Estimated Fair Value | 51 |  |
State and municipal obligations |  |  |
Available-for-sale debt securities: |  |  |
Cost | 102 | 172 |
Gross Unrealized Gains | 5 | 7 |
Gross Unrealized Losses | (1) | 0 |
Estimated Fair Value | 106 | 179 |
U.S. Government agency obligations |  |  |
Available-for-sale debt securities: |  |  |
Cost | 6 | 7 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 6 | 7 |
U.S. Government treasury obligations |  |  |
Available-for-sale debt securities: |  |  |
Cost | 8,718 | 20,655 |
Gross Unrealized Gains | 39 | 76 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 8,757 | 20,731 |
Mortgage-backed securities |  |  |
Available-for-sale debt securities: |  |  |
Cost | 19 | 28 |
Gross Unrealized Gains | 2 | 2 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 21 | 30 |
Foreign government bonds and obligations |  |  |
Available-for-sale debt securities: |  |  |
Cost | 556 | 581 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 556 | 581 |
Other |  |  |
Available-for-sale debt securities: |  |  |
Cost | 41 | 22 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | $ 41 | $ 22 |

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