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Debt - Long-term Debt (Details) - USD ($) $ in Millions		12 Months Ended
	May 17, 2021	Dec. 31, 2021	Dec. 31, 2020
Long-term debt
Principal amount		$ 2,796	$ 2,572
Unamortized discount and debt issuance costs		65	81
Total long-term debt		2,731	2,491
Current portion of long-term debt		3	2
Long-term debt, net		2,728	2,489
Long-term debt maturities
Scheduled principal payments 2022		3
Scheduled principal payments 2023		3
Scheduled principal payments 2024		3
Scheduled principal payments 2025		3
Scheduled principal payments 2026		$ 3
6.7% Senior Notes
Long-term debt
Interest rate on debt		6.70%
Redemption price, percentage		100.00%
Principal amount		$ 544	544
Long term debt		532	531
Unamortized discount and debt issuance costs		$ 12	13
6.95% Senior Notes
Long-term debt
Interest rate on debt		6.95%
Principal amount		$ 0	342
Long term debt		0	331
Unamortized discount and debt issuance costs		$ 0	11
7.25% 2063 Senior Notes
Long-term debt
Interest rate on debt		7.25%
Principal amount		$ 0	275
Long term debt		0	265
Unamortized discount and debt issuance costs		$ 0	10
7.25% 2064 Senior Notes
Long-term debt
Interest rate on debt		7.25%
Principal amount		$ 0	300
Long term debt		0	290
Unamortized discount and debt issuance costs		$ 0	10
6.25% Senior Notes
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
5.50% Senior Notes
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
5.50% Senior Notes
Long-term debt
Interest rate on debt	5.50%	5.50%
Redemption price, percentage	100.00%
Principal amount	$ 500	$ 500	0
Debt issuance costs	16
Long term debt	$ 484	484	0
Unamortized discount and debt issuance costs		$ 16	0
Callable Notes
Long-term debt
Redemption price, percentage		100.00%
Write-off of unamortized debt issuance costs		$ 31
UScellular Term loan agreement
Long-term debt
Principal amount		299	83
Long term debt		296	80
Unamortized discount and debt issuance costs		3	3
Receivables securitization facility
Long-term debt
Principal amount		450	25
Long term debt		450	25
Unamortized discount and debt issuance costs		0	0
Finance lease obligations
Long-term debt
Principal amount		3	3
Unamortized discount and debt issuance costs		0	0
Finance lease obligations		$ 3	$ 3
Treasury Rate | 6.7% Senior Notes
Long-term debt
Contractual spread		0.30%

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