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Investment Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest available-for-sale debt securities | $ 53 | $ 26
Available-for-sale debt securities: |  |
Cost | 21,150 |
Estimated Fair Value | 21,220 |
Equity securities |  |
Cost | 52 | 56
Gross Unrealized Gains | 1 | 27
Gross Unrealized Losses | (3) | (2)
Estimated Fair Value | 50 | 81
Total Cost | 21,202 | 21,521
Total Gross Unrealized Gains | 72 | 112
Total Gross Unrealized Losses | (4) | (2)
Total Estimated Fair Value | 21,270 | 21,631
State and municipal obligations |  |
Available-for-sale debt securities: |  |
Cost | 145 | 172
Gross Unrealized Gains | 5 | 7
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 149 | 179
U.S. Government agency obligations |  |
Available-for-sale debt securities: |  |
Cost | 7 | 7
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 7 | 7
U.S. Government treasury obligations |  |
Available-for-sale debt securities: |  |
Cost | 20,356 | 20,655
Gross Unrealized Gains | 64 | 76
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 20,420 | 20,731
Mortgage-backed securities |  |
Available-for-sale debt securities: |  |
Cost | 25 | 28
Gross Unrealized Gains | 2 | 2
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 27 | 30
Foreign government bonds and obligations |  |
Available-for-sale debt securities: |  |
Cost | 575 | 581
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 575 | 581
Other Debt Obligations |  |
Available-for-sale debt securities: |  |
Cost | 42 | 22
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 42 | $ 22

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