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Debt - Narrative (Details) - USD ($) $ in Millions | May 12, 2021 | Mar. 31, 2021
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Subsequent event |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 26 |
Redemption price rate | 100.00% |
6.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 6.875%
6.875% Senior Notes | Subsequent event |  |
Debt Instrument [Line Items] |  |
Amount redeemed | $ 225 |
Interest rate | 6.875% |
7.0% Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 7.00%
7.0% Senior Notes | Subsequent event |  |
Debt Instrument [Line Items] |  |
Amount redeemed | $ 300 |
Interest rate | 7.00% |
7.25% 2063 Senior Notes | UScellular | Subsequent event |  |
Debt Instrument [Line Items] |  |
Amount redeemed | $ 275 |
Interest rate | 7.25% |

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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