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v3.23.3

Investment Securities - Summary (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |
Accrued interest available-for-sale debt securities | $ 12 | $ 12 | $ 12
Debt securities |  |  |
Cost | 3,133 | 3,133 |
Estimated Fair Value | 3,094 | 3,094 |
Equity securities |  |  |
Cost | 60 | 60 | 50
Gross Unrealized Gains |  | 20 | 0
Gross Unrealized Losses |  | (14) | (9)
Estimated Fair Value | 66 | 66 | 41
Total Cost | 3,193 | 3,193 | 4,671
Total Gross Unrealized Gains |  | 20 | 0
Total Gross Unrealized Losses |  | (53) | (93)
Total Estimated Fair Value | 3,160 | 3,160 | 4,578
Other assets | 20,004 | 20,004 | 17,689
New public companies |  |  |
Equity securities |  |  |
Cost | 10 | 10 |
Gross Unrealized Gains | 37 |  |
Estimated Fair Value | 26 | 26 |
State and municipal obligations |  |  |
Debt securities |  |  |
Cost | 62 | 62 | 64
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (10) | (10)
Estimated Fair Value | 52 | 52 | 54
U.S. Government agency obligations |  |  |
Debt securities |  |  |
Cost | 4 | 4 | 5
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Estimated Fair Value | 4 | 4 | 5
U.S. Government treasury obligations |  |  |
Debt securities |  |  |
Cost | 2,214 | 2,214 | 3,859
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (27) | (73)
Estimated Fair Value | 2,187 | 2,187 | 3,786
Equity securities |  |  |
Other assets | 1,000 | 1,000 |
Non-cash transfer from investments | 1,000 |  |
Mortgage-backed securities |  |  |
Debt securities |  |  |
Cost | 12 | 12 | 13
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (1) | 0
Estimated Fair Value | 11 | 11 | 13
Foreign government bonds and obligations |  |  |
Debt securities |  |  |
Cost | 777 | 777 | 633
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (1) | (1)
Estimated Fair Value | 776 | 776 | 632
Other |  |  |
Debt securities |  |  |
Cost | 64 | 64 | 47
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Estimated Fair Value | $ 64 | $ 64 | $ 47

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