Investments - Total Investment Schedule (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Total Investments [Line Items] | ||
| Current | $ 2,629 | $ 2,145 |
| Long-term | 33,247 | 32,669 |
| Total | 35,876 | 34,814 |
| Debt securities available for sale | ||
| Total Investments [Line Items] | ||
| Current | 2,416 | 1,997 |
| Long-term | 26,933 | 26,721 |
| Total | 29,349 | 28,718 |
| Mortgage loans | ||
| Total Investments [Line Items] | ||
| Current | 213 | 148 |
| Long-term | 1,315 | 1,376 |
| Total | 1,528 | 1,524 |
| Other investments | ||
| Total Investments [Line Items] | ||
| Current | 0 | 0 |
| Long-term | 4,999 | 4,572 |
| Total | $ 4,999 | $ 4,572 |