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Revenues and Contract Costs - Additional Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment | Jun. 30, 2023 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 2 |
Revenue from arrangements not accounted for under Topic 606 | $ 753,000,000 | $ 754,000,000 | $ 1,500,000,000 | $ 1,500,000,000
Revenue recognized related to contract liabilities existing | 262,000,000 | 258,000,000 | 4,700,000,000 | 4,600,000,000
Amortization of deferred contract costs | 829,000,000 | 791,000,000 | 1,700,000,000 | 1,600,000,000
Contract assets impairment charge | $ 0 | $ 0 | $ 0 | $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 6 months |  | 6 months |
Revenue, remaining performance obligation | $ 14,800,000,000 |  | $ 14,800,000,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  | 1 year |
Revenue, remaining performance obligation | $ 24,500,000,000 |  | $ 24,500,000,000 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period |  |  |  |
Revenue, remaining performance obligation | $ 17,000,000,000 |  | $ 17,000,000,000 |
Wireless postpaid contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of month-to-month contracts of total service contracts | 95.00% | 94.00% | 95.00% | 94.00%
Wireline Consumer And Business Markets And Other Contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of month-to-month contracts of total service contracts | 95.00% | 94.00% | 95.00% | 94.00%
Customer Contracts that Have Contract Minimum over Total Contract Term | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 29 years |  | 29 years |
Revenue, remaining performance obligation | $ 2,000,000,000.0 |  | $ 2,000,000,000.0 |
Minimum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Deferred contract cost, amortization period | 2 years |  | 2 years |
Minimum | Wireless Service, Option One |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 1 month |
Minimum | Wireless Service, Option Two |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 1 month |
Minimum | Consumer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 12 months |
Minimum | Consumer | Reseller Arrangements |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 2 years |
Maximum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Deferred contract cost, amortization period | 7 years |  | 7 years |
Maximum | Wireless Service, Option One |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 36 months |
Maximum | Wireless Service, Option Two |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 36 months |
Maximum | Consumer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 2 years |
Maximum | Business |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer contracts service term |  |  | 12 months |

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