Leasing Activity, Operating Lease Right-of-Use (ROU) Assets and Lease Liabilities (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Leases [Abstract] | |||
| ROU assets | $ 3,630 | $ 3,641 | |
| Lease liabilities | $ 4,144 | $ 4,162 | |
| Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration] | Other assets | Other assets | |
| Operating lease, liability, statement of financial position [Extensible Enumeration] | Accounts Payable and Accrued Liabilities | Accounts Payable and Accrued Liabilities | |
| Total lease costs | $ 307 | $ 310 | |