Valuation And Qualifying Accounts (Allowance For Doubtful Accounts) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Allowance for Credit Loss | |||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance at Beginning of Period | $ 553 | $ 756 | $ 1,011 |
| Charged to Costs and Expenses | 2,271 | 1,969 | 1,969 |
| Charged to Other Accounts | 0 | 0 | 0 |
| Acquisitions | 0 | 0 | 0 |
| Deductions | 2,174 | 2,172 | 2,224 |
| Balance at End of Period | 650 | 553 | 756 |
| Allowance for Deferred Tax Assets | |||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||
| Balance at Beginning of Period | 4,338 | 4,656 | 4,175 |
| Charged to Costs and Expenses | (360) | (318) | 481 |
| Charged to Other Accounts | 0 | 0 | 0 |
| Acquisitions | 0 | 0 | 0 |
| Deductions | 0 | 0 | 0 |
| Balance at End of Period | $ 3,978 | $ 4,338 | $ 4,656 |