Investments - Net Realized Investment Gains (Losses) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Gross realized gains on sales of available-for-sale securities | $ 1 | $ 1 | $ 4 | $ 2 |
| Gross realized losses on sales of available-for-sale securities | (1) | (4) | (9) | (7) |
| Net foreign currency gains (losses) | 0 | (2) | (1) | (2) |
| Change in the allowance for credit losses and intent to sell | (3) | (2) | (13) | 8 |
| Other net realized gains (losses) | (3) | 1 | (3) | 1 |
| Net realized investment gains (losses) | $ (6) | $ (6) | $ (22) | $ 2 |
| X | ||||||||||
- Definition Net Realized Investment Gains (Losses) No definition available.
|
| X | ||||||||||
- Definition Amount, excluding accrued interest, of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount, before tax, of realized gain (loss) from foreign currency transaction. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- References No definition available.
|