Leasing Activity, Operating Lease Right-of-Use (ROU) Assets and Lease Liabilities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Leases [Abstract] | |||||
| ROU assets | $ 3,633 | $ 3,633 | $ 3,641 | ||
| Lease liabilities | $ 4,138 | $ 4,138 | $ 4,162 | ||
| Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration] | Other assets | Other assets | Other assets | ||
| Operating lease, liability, statement of financial position [Extensible Enumeration] | Accounts Payable and Accrued Liabilities | Accounts Payable and Accrued Liabilities | Accounts Payable and Accrued Liabilities | ||
| Total lease costs | $ 295 | $ 283 | $ 602 | $ 593 | |