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Revenue and Contract Costs - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Number of reportable segments | segment | 2 |  |
Revenue from arrangements not accounted for under Topic 606 | $ 2,900,000,000 | $ 3,200,000,000 | $ 3,100,000,000
Contract with customer liability period increase | 668,000,000 |  |
Revenue recognized from previously recognized contract liability | 4,900,000,000 | 5,000,000,000 |
Amortization of deferred contract costs | 3,200,000,000 | 3,000,000,000 |
Deferred contract costs, impairment charges | $ 0 | $ 0 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 1 year |  |
Revenue, remaining performance obligation | $ 25,700,000,000 |  |
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 |  |
Revenue, remaining performance obligation | $ 18,700,000,000 |  |
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 | $ 7,500,000,000 |  |
Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred contract cost, amortization period | 1 year |  |
Minimum | Consumer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 12 months |  |
Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred contract cost, amortization period | 7 years |  |
Maximum | Consumer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 2 years |  |
Maximum | Business |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 12 months |  |
Wireless postpaid contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of month-to-month contracts of total service contracts | 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 | 94.00% | 92.00% |
Wireless Service, Device Payment Plans | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 1 month |  |
Wireless Service, Device Payment Plans | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 36 months |  |
Wireless Service, Fixed Term Plans | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 1 month |  |
Wireless Service, Fixed Term Plans | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 24 months |  |
Reseller Arrangements | Minimum | Consumer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract term | 2 years |  |
Customer Contracts that Have Contract Minimum over Total Contract Term | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 30 years |  |
Revenue, remaining performance obligation | $ 2,100,000,000 |  |

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