Fair Value - Schedule of Gain (Losses) Recorded for Financial Instruments Elected the Fair Value Option (Details) - Retirement Services - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | $ (551) | $ 1,248 | $ (1,534) | $ 2,412 |
| Trading securities | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | 62 | 261 | (190) | 336 |
| Mortgage loans | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | (624) | 892 | (1,375) | 1,933 |
| Investment funds | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | 6 | 114 | (4) | 155 |
| Future policy benefits | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | 7 | 10 | 31 | 5 |
| Other | ||||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||||
| Total gains (losses) | $ (2) | $ (29) | $ 4 | $ (17) |