Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Leases [Abstract] | ||
| Operating lease ROU assets | $ 705 | $ 591 |
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
| Finance lease ROU assets | $ 35 | $ 47 |
| Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Equipment, office facilities, and property — net | Equipment, office facilities, and property — net |
| Operating lease liabilities | $ 903 | $ 816 |
| Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Accrued expenses and other liabilities | Accrued expenses and other liabilities |
| Finance lease liabilities | $ 37 | $ 49 |
| Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt | Long-term debt |