Revenue Recognition (Deferred Contract Acquisition and Fulfillment Costs) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Deferred Acquisition Costs | ||
| Capitalized Contract Cost, Net [Abstract] | ||
| Total deferred costs | $ 8,328 | $ 7,416 |
| Deferred cost amortization | 3,837 | 3,667 |
| Deferred Acquisition Costs | Prepaid and other current assets | ||
| Capitalized Contract Cost, Net [Abstract] | ||
| Total deferred costs | 3,550 | 3,239 |
| Deferred Acquisition Costs | Other Assets | ||
| Capitalized Contract Cost, Net [Abstract] | ||
| Total deferred costs | 4,778 | 4,177 |
| Deferred Fulfillment Costs | ||
| Capitalized Contract Cost, Net [Abstract] | ||
| Total deferred costs | 4,726 | 5,390 |
| Deferred cost amortization | 2,279 | 2,525 |
| Deferred Fulfillment Costs | Prepaid and other current assets | ||
| Capitalized Contract Cost, Net [Abstract] | ||
| Total deferred costs | 1,862 | 2,101 |
| Deferred Fulfillment Costs | Other Assets | ||
| Capitalized Contract Cost, Net [Abstract] | ||
| Total deferred costs | $ 2,864 | $ 3,289 |