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v3.23.1

Investment Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest available-for-sale debt securities | $ 12 | $ 12
Available-for-sale debt securities: |  |
Cost | 3,981 |
Estimated Fair Value | 3,922 |
Equity securities |  |
Cost | 50 | 50
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8) | (9)
Estimated Fair Value | 42 | 41
Total Cost | 4,031 | 4,671
Total Gross Unrealized Gains | 0 | 0
Total Gross Unrealized Losses | (67) | (93)
Total Estimated Fair Value | 3,964 | 4,578
State and municipal obligations |  |
Available-for-sale debt securities: |  |
Cost | 63 | 64
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8) | (10)
Estimated Fair Value | 55 | 54
U.S. Government agency obligations |  |
Available-for-sale debt securities: |  |
Cost | 4 | 5
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4 | 5
U.S. Government treasury obligations |  |
Available-for-sale debt securities: |  |
Cost | 3,180 | 3,859
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (50) | (73)
Estimated Fair Value | 3,130 | 3,786
Mortgage-backed securities |  |
Available-for-sale debt securities: |  |
Cost | 13 | 13
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 13 | 13
Foreign government bonds and obligations |  |
Available-for-sale debt securities: |  |
Cost | 669 | 633
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 668 | 632
Other |  |
Available-for-sale debt securities: |  |
Cost | 52 | 47
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 52 | $ 47

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