Property and Equipment - Schedule of Asset Retirement Obligation (Details) $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2025
USD ($)
| |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| Asset retirement obligations, beginning of year | $ 1,535 |
| Fair value of liabilities acquired from the UScellular Acquisition | 165 |
| Liabilities incurred | 18 |
| Liabilities settled | (40) |
| Accretion expense | 52 |
| Asset retirement obligations, end of period | 1,730 |
| Classified on the consolidated balance sheets | 1,730 |
| Other current liabilities | |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| Asset retirement obligations, end of period | 117 |
| Classified on the consolidated balance sheets | 117 |
| Other long-term liabilities | |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | |
| Asset retirement obligations, end of period | 1,613 |
| Classified on the consolidated balance sheets | $ 1,613 |