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Investment Securities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest available-for-sale debt securities | $ 21 | $ 26
Available-for-sale debt securities: |  |
Cost | 12,336 |
Estimated Fair Value | 12,392 |
Equity securities |  |
Cost | 52 | 56
Gross Unrealized Gains | 1 | 27
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 51 | 81
Total Cost | 12,388 | 21,521
Total Gross Unrealized Gains | 58 | 112
Total Gross Unrealized Losses | (3) | (2)
Total Estimated Fair Value | 12,443 | 21,631
State and municipal obligations |  |
Available-for-sale debt securities: |  |
Cost | 133 | 172
Gross Unrealized Gains | 6 | 7
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 138 | 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 | 11,397 | 20,655
Gross Unrealized Gains | 49 | 76
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 11,446 | 20,731
Mortgage-backed securities |  |
Available-for-sale debt securities: |  |
Cost | 22 | 28
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 24 | 30
Foreign government bonds and obligations |  |
Available-for-sale debt securities: |  |
Cost | 741 | 581
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 741 | 581
Other Debt Securities |  |
Available-for-sale debt securities: |  |
Cost | 37 | 22
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 37 | $ 22

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