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Debt and Other Obligations (Debt Purchases and Repayments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  | $ 750 | $ 750 | $ 1,250
Cash paid | [1] | 750 | 750 | 1,274
Gains (losses) on retirement of long-term obligations | [2] | 0 | 0 | (28)
2018 Tower Revenue Notes 3.720% due 2043 [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  |  | 250
Cash paid | [1] |  |  | 252
Gains (losses) on retirement of long-term obligations | [2] |  |  | (3)
3.849% Secured Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  |  | 1,000
Cash paid | [1] |  |  | 1,022
Gains (losses) on retirement of long-term obligations | [2] |  |  | (23)
Revolving Credit Facility [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  |  | 0
Cash paid | [1] |  |  | 0
Gains (losses) on retirement of long-term obligations | [2] |  |  | $ (2)
3.150% Senior Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  |  | 750 |
Cash paid | [1] |  | 750 |
Gains (losses) on retirement of long-term obligations | [2] | 0 | $ 0 |
August 2017 Senior Unsecured 3.200% Notes [Member] |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |
Principal amount |  | 750 |  |
Cash paid | [1] | $ 750 |  |
[1] | Exclusive of accrued interest.
[2] | Inclusive of the write-off of the respective deferred financing costs

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481303/470-50-40-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481303/470-50-40-4 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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