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Investment Securities - Summary (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Available-for-sale debt securities: |  |  |
Cost |  | $ 2,138 |
Estimated Fair Value |  | 2,120 | $ 4,537
Equity securities |  |  |
Cost |  | 60 | 50
Gross Unrealized Gains |  | 16 | 0
Gross Unrealized Losses |  | (10) | (9)
Estimated Fair Value |  | 66 | 41
Total Cost |  | 2,198 | 4,671
Total Gross Unrealized Gains |  | 17 | 0
Total Gross Unrealized Losses |  | (29) | (93)
Total Estimated Fair Value |  | 2,186 | 4,578
New public companies |  |  |
Equity securities |  |  |
Cost |  | 10 |
Estimated Fair Value |  | 24 |
Net unrealized gains on equity securities | $ 37 |  |
State and municipal obligations |  |  |
Available-for-sale debt securities: |  |  |
Cost |  | 61 | 64
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (6) | (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 |  | 1,217 | 3,859
Gross Unrealized Gains |  | 1 | 0
Gross Unrealized Losses |  | (12) | (73)
Estimated Fair Value |  | 1,206 | 3,786
Mortgage-backed securities |  |  |
Available-for-sale debt securities: |  |  |
Cost |  | 12 | 13
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | (1) | 0
Estimated Fair Value |  | 11 | 13
Foreign government bonds and obligations |  |  |
Available-for-sale debt securities: |  |  |
Cost |  | 770 | 633
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | (1)
Estimated Fair Value |  | 770 | 632
Other |  |  |
Available-for-sale debt securities: |  |  |
Cost |  | 74 | 47
Gross Unrealized Gains |  | 0 | 0
Gross Unrealized Losses |  | 0 | 0
Estimated Fair Value |  | $ 74 | $ 47

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