Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt (Schedule of Carrying and Principal Values of Debt) (Details) - USD ($)							6 Months Ended
	Mar. 09, 2018	Apr. 17, 2017	Jul. 07, 2016	Oct. 14, 2015	Oct. 15, 2014	Apr. 18, 2013	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Principal Balance							$ 9,800,000,000	$ 9,405,000,000
Fair Value							9,625,580,000	9,436,290,000
Carrying Value							9,699,738,000	9,310,686,000
Less: current maturities of long-term debt							(24,000,000)	(20,000,000)
Total long-term debt, net of current maturities							$ 9,675,738,000	9,290,686,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Apr. 11, 2023
Principal Balance							$ 85,000,000	40,000,000
Fair Value							85,000,000	40,000,000
Carrying Value							$ 85,000,000	40,000,000
2014 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Jul. 15, 2022
Principal Balance							$ 750,000,000	750,000,000
Fair Value							746,250,000	770,625,000
Carrying Value							$ 740,162,000	739,079,000
2016 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Sep. 01, 2024
Principal Balance							$ 1,100,000,000	1,100,000,000
Fair Value							1,056,000,000	1,127,500,000
Carrying Value							$ 1,082,460,000	1,081,262,000
2017 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Oct. 01, 2022
Principal Balance							$ 750,000,000	750,000,000
Fair Value							720,000,000	750,938,000
Carrying Value							$ 742,259,000	741,437,000
2013-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date						Apr. 09, 2043	Apr. 10, 2018
Principal Balance								425,000,000
Fair Value								423,853,000
Carrying Value								424,482,000
2013-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date						Apr. 09, 2048	Apr. 11, 2023
Principal Balance							$ 575,000,000	575,000,000
Fair Value							564,644,000	578,433,000
Carrying Value							$ 569,156,000	568,609,000
2013-1D Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date						Apr. 09, 2043	Apr. 10, 2018
Principal Balance								330,000,000
Fair Value								330,145,000
Carrying Value								329,585,000
2014-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date					Oct. 11, 2044		Oct. 08, 2019
Principal Balance							$ 920,000,000	920,000,000
Fair Value							909,402,000	915,216,000
Carrying Value							$ 916,317,000	914,929,000
2014-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date					Oct. 08, 2049		Oct. 08, 2024
Principal Balance							$ 620,000,000	620,000,000
Fair Value							605,535,000	620,942,000
Carrying Value							$ 613,884,000	613,461,000
2015-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Oct. 10, 2045			Oct. 08, 2020
Principal Balance							$ 500,000,000	500,000,000
Fair Value							490,560,000	496,840,000
Carrying Value							$ 494,593,000	493,474,000
2016-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date			Jul. 10, 2046				Jul. 09, 2021
Principal Balance							$ 700,000,000	700,000,000
Fair Value							687,757,000	691,166,000
Carrying Value							$ 694,046,000	693,118,000
2017-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Apr. 09, 2047					Apr. 11, 2022
Principal Balance							$ 760,000,000	760,000,000
Fair Value							738,165,000	751,404,000
Carrying Value							$ 752,037,000	751,076,000
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 09, 2048						Mar. 09, 2023
Principal Balance							$ 640,000,000
Fair Value							637,267,000
Carrying Value							$ 631,956,000
2014 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Mar. 24, 2021
Principal Balance								1,447,500,000
Fair Value								1,451,119,000
Carrying Value								1,439,373,000
2015 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Jun. 10, 2022
Principal Balance								487,500,000
Fair Value								488,109,000
Carrying Value								$ 480,801,000
2018 Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date							Apr. 11, 2025
Principal Balance							$ 2,400,000,000
Fair Value							2,385,000,000
Carrying Value							$ 2,377,868,000