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Debt - Long-Term Debt (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Apr. 01, 2025 | Apr. 01, 2024 | Dec. 31, 2022 USD ($)
Long-term debt |  |  |  |
Principal amount | $ 4,179 |  |  | $ 3,822
Unamortized discount and debt issuance costs | 73 |  |  | 72
Total long term debt | 4,106 |  |  | 3,750
Current portion of long-term debt | 26 |  |  | 19
Long-term debt, net | 4,080 |  |  | 3,731
Long-term debt maturities |  |  |  |
Scheduled principal payments 2024 | 26 |  |  |
Scheduled principal payments 2025 | 26 |  |  |
Scheduled principal payments 2026 | 676 |  |  |
Scheduled principal payments 2027 | 319 |  |  |
Scheduled principal payments 2028 | $ 482 |  |  |
Consolidated leverage ratio | 4.25 |  |  |
Consolidated interest coverage ratio | 3.00 |  |  |
Subsequent Event |  |  |  |
Long-term debt maturities |  |  |  |
Consolidated leverage ratio |  | 3.75 | 4.00 |
6.7% Senior Notes | UScellular |  |  |  |
Long-term debt |  |  |  |
Interest rate on debt | 6.70% |  |  |
Principal amount | $ 544 |  |  | 544
Long-term debt | 533 |  |  | 533
Unamortized discount and debt issuance costs | $ 11 |  |  | 11
Redemption price, percentage | 100.00% |  |  |
6.7% Senior Notes | Treasury Rate | UScellular |  |  |  |
Long-term debt |  |  |  |
Interest rate on debt | 0.30% |  |  |
6.25% Senior Notes | UScellular |  |  |  |
Long-term debt |  |  |  |
Interest rate on debt | 6.25% |  |  |
Principal amount | $ 500 |  |  | 500
Long-term debt | 483 |  |  | 483
Unamortized discount and debt issuance costs | $ 17 |  |  | 17
5.5% Senior Notes | UScellular |  |  |  |
Long-term debt |  |  |  |
Interest rate on debt | 5.50% |  |  |
Principal amount | $ 500 |  |  | 500
Long-term debt | 483 |  |  | 483
Unamortized discount and debt issuance costs | $ 17 |  |  | 17
5.5% Senior Notes | UScellular |  |  |  |
Long-term debt |  |  |  |
Interest rate on debt | 5.50% |  |  |
Principal amount | $ 500 |  |  | 500
Long-term debt | 484 |  |  | 484
Unamortized discount and debt issuance costs | $ 16 |  |  | 16
Callable Notes |  |  |  |
Long-term debt |  |  |  |
Redemption price, percentage | 100.00% |  |  |
UScellular Term Loan Agreements | UScellular |  |  |  |
Long-term debt |  |  |  |
Principal amount | $ 783 |  |  | 796
Long-term debt | 779 |  |  | 790
Unamortized discount and debt issuance costs | 4 |  |  | 6
TDS Term Loan Agreements |  |  |  |
Long-term debt |  |  |  |
Principal amount | 492 |  |  | 497
Long-term debt | 488 |  |  | 493
Unamortized discount and debt issuance costs | 4 |  |  | 4
TDS secured term loan |  |  |  |
Long-term debt |  |  |  |
Principal amount | 300 |  |  | 0
Long-term debt | 297 |  |  | 0
Unamortized discount and debt issuance costs | 3 |  |  | 0
Receivables securitization agreement | UScellular |  |  |  |
Long-term debt |  |  |  |
Principal amount | 150 |  |  | 275
Long-term debt | 150 |  |  | 275
Unamortized discount and debt issuance costs | 0 |  |  | 0
TDS export credit financing agreement |  |  |  |
Long-term debt |  |  |  |
Principal amount | 150 |  |  | 50
Long-term debt | 150 |  |  | 50
Unamortized discount and debt issuance costs | 0 |  |  | 0
UScellular export credit financing agreement | UScellular |  |  |  |
Long-term debt |  |  |  |
Principal amount | 150 |  |  | 150
Long-term debt | 149 |  |  | 149
Unamortized discount and debt issuance costs | 1 |  |  | 1
TDS Revolving Credit Agreement |  |  |  |
Long-term debt |  |  |  |
Principal amount | 100 |  |  | 0
Long-term debt | 100 |  |  | 0
Unamortized discount and debt issuance costs | 0 |  |  | 0
Finance lease obligations |  |  |  |
Long-term debt |  |  |  |
Principal amount | 6 |  |  | 7
Long-term debt | 6 |  |  | 7
Unamortized discount and debt issuance costs | 0 |  |  | 0
Other long-term notes |  |  |  |
Long-term debt |  |  |  |
Principal amount | 4 |  |  | 3
Long-term debt | 4 |  |  | 3
Unamortized discount and debt issuance costs | 0 |  |  | $ 0
Subordination Agreement | UScellular |  |  |  |
Long-term debt maturities |  |  |  |
Consolidated funded indebtedness | 0 |  |  |
Refinancing indebtedness | 0 |  |  |
Subordination Agreement | UScellular | Maximum |  |  |  |
Long-term debt maturities |  |  |  |
Consolidated funded indebtedness | 105 |  |  |
Refinancing indebtedness | $ 250 |  |  |

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