Future Policy Benefit Reserves - Earned Premiums and Interest Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Insurance [Abstract] | ||||
| Earned premiums | $ 106 | $ 109 | $ 212 | $ 219 |
| Interest accretion | $ 185 | $ 185 | $ 370 | $ 369 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of gross premium income recognized for liability for future policy benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of interest expense recognized for liability for future policy benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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