Fair Value - Schedule of Gain (Losses) Recorded for Financial Instruments Elected the Fair Value Option (Details) - Retirement Services - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | $ 258 | $ 1,314 | $ 2,670 | $ 933 |
| Trading securities | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | 43 | 131 | 379 | 31 |
| Mortgage loans | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | 197 | 1,186 | 2,130 | 868 |
| Investment funds | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | 9 | 38 | 164 | 13 |
| Future policy benefits | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | (5) | (46) | 0 | 12 |
| Other | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | $ 14 | $ 5 | $ (3) | $ 9 |