Investment Securities (Tables)
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6 Months Ended |
Jun. 30, 2026 |
| Investments, Debt and Equity Securities [Abstract] |
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| Schedule of the Cost/Amortized Cost, Unrealized Gains and Losses, and Fair Value of Available-for-sale Securities by Type |
Cost/amortized cost, allowance for credit losses, unrealized gains and losses, and fair value of fixed maturity available-for-sale securities by type were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (dollars in millions) | | Cost/ Amortized Cost | | | | Unrealized Gains | | Unrealized Losses | | Fair Value | | | | | | | | | | | | | June 30, 2026* | | | | | | | | | | | | Fixed maturity available-for-sale securities: | | | | | | | | | | | | U.S. government and government sponsored entities | | $ | 13 | | | | | $ | — | | | $ | — | | | $ | 13 | | Obligations of states, municipalities, and political subdivisions | | 57 | | | | | — | | | (3) | | | 54 | | Commercial paper | | 58 | | | | | — | | | — | | | 58 | | Non-U.S. government and government sponsored entities | | 139 | | | | | 1 | | | (3) | | | 137 | | Corporate debt | | 1,088 | | | | | 5 | | | (45) | | | 1,048 | | Mortgage-backed, asset-backed, and collateralized: | | | | | | | | | | | RMBS | | 207 | | | | | 1 | | | (18) | | | 190 | | CMBS | | 20 | | | | | — | | | (2) | | | 18 | | CDO/ABS | | 70 | | | | | — | | | (1) | | | 69 | | | Total | | $ | 1,652 | | | | | $ | 7 | | | $ | (72) | | | $ | 1,587 | | | | | | | | | | | | | | December 31, 2025* | | | | | | | | | | | | Fixed maturity available-for-sale securities: | | | | | | | | | | | U.S. government and government sponsored entities | | $ | 13 | | | | | $ | — | | | $ | — | | | $ | 13 | | Obligations of states, municipalities, and political subdivisions | | 59 | | | | | — | | | (3) | | | 56 | | | Commercial paper | | — | | | | | — | | | — | | | — | | | Non-U.S. government and government sponsored entities | | 159 | | | | | 1 | | | (3) | | | 157 | | | Corporate debt | | 1,057 | | | | | 11 | | | (38) | | | 1,030 | | Mortgage-backed, asset-backed, and collateralized: | | | | | | | | | | | | RMBS | | 206 | | | | | 1 | | | (17) | | | 190 | | | CMBS | | 24 | | | | | — | | | (2) | | | 22 | | | CDO/ABS | | 66 | | | | | — | | | (2) | | | 64 | | | Total | | $ | 1,584 | | | | | $ | 13 | | | $ | (65) | | | $ | 1,532 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
* The allowance for credit losses related to our investment securities as of June 30, 2026 and December 31, 2025 was immaterial.
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| Schedule of Fair Value and Unrealized Losses on Investment Securities by Type and Length of Time In a Continuous Unrealized Loss Position |
Fair value and unrealized losses on available-for-sale securities by type and length of time in a continuous unrealized loss position without an allowance for credit losses were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Less Than 12 Months | | 12 Months or Longer | | Total | | (dollars in millions) | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | | | | | | | | | | | | | | June 30, 2026 | | | | | | | | | | | | | U.S. government and government sponsored entities | | $ | 5 | | | $ | — | | | $ | 8 | | | $ | — | | | $ | 13 | | | $ | — | | Obligations of states, municipalities, and political subdivisions | | 4 | | | — | | | 43 | | | (3) | | | 47 | | | (3) | | | | | | | | | | | | | | | Non-U.S. government and government sponsored entities | | 30 | | | — | | | 31 | | | (3) | | | 61 | | | (3) | | | Corporate debt | | 283 | | | (4) | | | 490 | | | (41) | | | 773 | | | (45) | | Mortgage-backed, asset-backed, and collateralized: | | | | | | | | | | | | | | RMBS | | 32 | | | — | | | 117 | | | (18) | | | 149 | | | (18) | | | CMBS | | 2 | | | — | | | 14 | | | (2) | | | 16 | | | (2) | | | CDO/ABS | | 33 | | | — | | | 23 | | | (1) | | | 56 | | | (1) | | | Total | | $ | 389 | | | $ | (4) | | | $ | 726 | | | $ | (68) | | | $ | 1,115 | | | $ | (72) | | | | | | | | | | | | | | | December 31, 2025 | | | | | | | | | | | | | U.S. government and government sponsored entities | | $ | — | | | $ | — | | | $ | 8 | | | $ | — | | | $ | 8 | | | $ | — | | Obligations of states, municipalities, and political subdivisions | | 1 | | | — | | | 48 | | | (3) | | | 49 | | | (3) | | | | | | | | | | | | | | | Non-U.S. government and government sponsored entities | | 23 | | | — | | | 37 | | | (3) | | | 60 | | | (3) | | | Corporate debt | | 73 | | | — | | | 545 | | | (38) | | | 618 | | | (38) | | Mortgage-backed, asset-backed, and collateralized: | | | | | | | | | | | | | | RMBS | | 6 | | | — | | | 124 | | | (17) | | | 130 | | | (17) | | | CMBS | | 1 | | | — | | | 19 | | | (2) | | | 20 | | | (2) | | | CDO/ABS | | 6 | | | — | | | 28 | | | (2) | | | 34 | | | (2) | | | Total | | $ | 110 | | | $ | — | | | $ | 809 | | | $ | (65) | | | $ | 919 | | | $ | (65) | |
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| Schedule of Contractual Maturities of Fixed-Maturity Available-for-sale Securities |
Contractual maturities of fixed-maturity available-for-sale securities at June 30, 2026 were as follows: | | | | | | | | | | | | | | | | (dollars in millions) | | Fair Value | | Amortized Cost | | | | | | Fixed maturities, excluding mortgage-backed, asset-backed, and collateralized securities: | | | | | | Due in 1 year or less | | $ | 203 | | | $ | 205 | | | Due after 1 year through 5 years | | 596 | | | 613 | | | Due after 5 years through 10 years | | 371 | | | 382 | | | Due after 10 years | | 140 | | | 155 | | | Mortgage-backed, asset-backed, and collateralized securities | | 277 | | | 297 | | | Total | | $ | 1,587 | | | $ | 1,652 | |
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| Schedule of Fair Value of Other Securities by Type |
The fair value of other securities by type was as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | (dollars in millions) | | June 30, 2026 | | December 31, 2025 | | | | | | | | | | | | Fixed maturity other securities: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Bonds | | $ | 4 | | | $ | 6 | | Preferred stock | | 12 | | | 12 | | Common stock | | 46 | | | 40 | | | | | | | | Total | | $ | 62 | | | $ | 58 | |
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