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Debt and Other Obligations Schedule of Extinguishment of Long Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Extinguishment of Debt [Line Items] |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ (3) | $ 0 | $ (74) | $ (4)
January 2010 Tower Revenue Notes [Member] |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 1,250 |
Repayments of Debt | [1] |  |  | 1,318 |
Gain (Loss) on Extinguishment of Debt | [2] |  |  | (71) |
2016 Term Loan A [Member] |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 0 |
Repayments of Debt |  |  |  | 0 |
Gain (Loss) on Extinguishment of Debt | [3] |  |  | $ (3) |
[1] | Exclusive of accrued interest
[2] | Inclusive of the write off of respective deferred financing costs.
[3] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjMwYmFhYmQzNDhkYzQ5ZjlhODZmNmE5MzJmNTUyNmYyfFRleHRTZWxlY3Rpb246ODBBNUUwNDQzQUVGOTIyRUMyMTZDRDM2Rjc1MTAyNTkM}

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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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