Debt Covenant, Additional Secured Debt, Percent Of Tangible Net Worth

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Debt Covenant, Additional Secured Debt, Value

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Debt Covenant, Aggregate Amount Of Available Cash

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Debt Covenant, Aggregate Amount Of Available Cash, After Repayments

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Debt Covenant, Period For Repayment Of Acquired Companies

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Maximum Percent of Debt to Total Capitalization Ratio

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Potential additional revolver capacity if committements are received from new or existing syndicate lenders.

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Senior Note Maturity Year

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Tender Offer

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt discount (premium).

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of interest capitalized during the period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Fair value of the amount outstanding under the credit facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Number of new stock issued during the period.

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Debt (Narrative) (Details) - USD ($)	3 Months Ended						12 Months Ended
Debt (Narrative) (Details) - USD ($)	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2015	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2018	Feb. 28, 2018	Feb. 09, 2018	Oct. 31, 2017	Jan. 05, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Tender Offer			$ 750,000,000					$ 750,000,000
Stock Issued During Period, Shares, New Issues	65,550,000		1,822,432					1,822,432
Gain (Loss) on Extinguishment of Debt		$ 6,200,000					$ (2,600,000)	$ 287,800,000	$ (33,500,000)
Interest Expense							224,200,000	228,800,000	216,300,000
Capitalized interest							$ 72,500,000	$ 45,700,000	$ 87,400,000
Common Stock, Dividends, Per Share, Cash Paid							$ 0.04	$ 0.04	$ 0.60
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage								0.00%
Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage								0.00%
3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Senior Note Maturity Year							2024
Debt instrument, interest rate, stated percentage							3.00%
5.20% Senior notes due 2025
Debt Instrument [Line Items]
Senior Note Maturity Year							2025
Debt instrument, interest rate, stated percentage							5.20%
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Senior Note Maturity Year							2044
Debt instrument, interest rate, stated percentage							5.75%
4.50% Senior notes due 2024
Debt Instrument [Line Items]
Senior Note Maturity Year							2024
Debt instrument, interest rate, stated percentage							4.50%
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Senior Note Maturity Year							2021
Debt instrument, interest rate, stated percentage							4.70%
6.875% Senior notes due 2020
Debt Instrument [Line Items]
Senior Note Maturity Year							2020
Debt instrument, interest rate, stated percentage							6.875%
8.50% Senior notes due 2019
Debt Instrument [Line Items]
Senior Note Maturity Year							2019
Debt instrument, interest rate, stated percentage							8.50%
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Senior Note Maturity Year							2040
Debt instrument, interest rate, stated percentage							7.875%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Senior Note Maturity Year							2027
Debt instrument, interest rate, stated percentage							7.20%
8.00% Senior notes due 2024
Debt Instrument [Line Items]
Senior Note Maturity Year							2024
Debt instrument, interest rate, stated percentage							8.00%
Tender Offer [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			$ 860,700,000					$ 860,700,000
Debt Instrument, Repurchase Amount			622,300,000					622,300,000
Open Market Repurchases [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			269,900,000				$ 194,100,000	269,900,000
Debt Instrument, Repurchase Amount			241,600,000				204,500,000	241,600,000
Revolving Credit Facility [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Current borrowing capacity			2,000,000,000				2,000,000,000	$ 2,000,000,000						$ 2,250,000,000
Potential_Additional_Revolver_Capacity							$ 1,500,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage								0.75%
Maximum Percent of Debt to Total Capitalization Ratio							60.00%
Line of Credit Facility, Fair Value of Amount Outstanding			0					$ 0
Debt Covenant, Additional Secured Debt, Value							$ 750,000,000
Debt Covenant, Additional Secured Debt, Percent Of Tangible Net Worth							10.00%
Common Stock, Dividends, Per Share, Cash Paid							$ 0.01
Debt Covenant, Aggregate Amount Of Available Cash							$ 150,000,000
Revolving Credit Facility [Member] \| Credit Facility due 2020 [Member]
Debt Instrument [Line Items]
Current borrowing capacity							1,300,000,000							$ 1,130,000,000
Revolving Credit Facility [Member] \| Credit Facility due 2019 [Member]
Debt Instrument [Line Items]
Current borrowing capacity							$ 1,200,000,000
Debt Covenant, Period For Repayment Of Acquired Companies							90 days
Debt Covenant, Aggregate Amount Of Available Cash, After Repayments							$ 250,000,000
Revolving Credit Facility [Member] \| Base Rate [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate								3.00%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate								4.00%
Convertible Debt [Member] \| 3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization							25,500,000	$ 1,300,000
Amortization of Debt Issuance Costs and Discounts							31,400,000	1,500,000
Debt Instrument, Face Amount			849,500,000				$ 849,500,000	849,500,000
Senior Note Maturity Year							2024
Conversion rate per $1,000 principal amount of shares							71.3343
Debt Instrument, Convertible, Conversion Price							$ 14.02
Debt instrument, interest rate, stated percentage							8.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			1,130,600,000				$ 194,100,000	1,130,600,000
Debt Instrument, Repurchase Amount			863,900,000				204,500,000	863,900,000
Gain (Loss) on Extinguishment of Debt							$ 18,200,000
Senior Notes [Member] \| 5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 700,000,000
Senior Note Maturity Year							2025
Debt instrument, interest rate, stated percentage							5.20%
Debt Instrument, Unamortized Discount (Premium), Net																$ 2,600,000
Debt Instrument, Repurchased Face Amount			30,700,000					30,700,000
Debt Instrument, Repurchase Amount			16,800,000					16,800,000
Senior Notes [Member] \| 5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 625,000,000						$ 400,000,000
Senior Note Maturity Year				2044						2044
Debt instrument, interest rate, stated percentage										5.75%						5.75%
Debt Instrument, Unamortized Discount (Premium), Net										$ 2,800,000						$ 18,700,000
Debt Instrument, Repurchased Face Amount			24,500,000					24,500,000
Gain (Loss) on Extinguishment of Debt								8,800,000
Senior Notes [Member] \| 4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 625,000,000
Senior Note Maturity Year										2024
Debt instrument, interest rate, stated percentage										4.50%
Debt Instrument, Unamortized Discount (Premium), Net										$ 850,000
Debt Instrument, Repurchased Face Amount			1,700,000					1,700,000
Debt Instrument, Repurchase Amount			900,000					900,000
Senior Notes [Member] \| 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 1,500,000,000
Senior Note Maturity Year					2021	2021
Debt instrument, interest rate, stated percentage					4.70%	4.70%
Debt Instrument, Unamortized Discount (Premium), Net						$ 29,600,000
Debt Instrument, Repurchased Face Amount		373,900,000	817,000,000				$ 39,400,000	817,000,000
Debt Instrument, Repurchase Amount			609,000,000				39,300,000	609,000,000
Senior Notes [Member] \| 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 900,000,000
Senior Note Maturity Year					2020	2020
Debt instrument, interest rate, stated percentage					6.875%	6.875%
Debt Instrument, Repurchased Face Amount		129,800,000	219,200,000				100,100,000	219,200,000
Debt Instrument, Repurchase Amount			$ 181,500,000				105,100,000	$ 181,500,000
Senior Notes [Member] \| 8.50% Senior notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 500,000,000
Senior Note Maturity Year						2019		2019
Debt instrument, interest rate, stated percentage			8.50%			8.50%		8.50%
Debt Instrument, Repurchased Face Amount		145,800,000	$ 62,000,000				54,600,000	$ 62,000,000
Debt Instrument, Repurchase Amount			55,700,000				60,100,000	55,700,000
Senior Notes [Member] \| 7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 300,000,000
Senior Note Maturity Year						2040
Debt instrument, interest rate, stated percentage						7.875%
Senior Notes [Member] \| 7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 150,000,000					$ 150,000,000
Debt instrument, interest rate, stated percentage			7.20%					7.20%
Senior Notes [Member] \| 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount		332,000,000					$ 332,000,000
Senior Note Maturity Year							2024	2024
Debt instrument, interest rate, stated percentage			8.00%				8.00%	8.00%
Scenario, Forecast
Debt Instrument [Line Items]
Tender Offer											$ 985,000,000
Scenario, Forecast \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount											650,400,000
Debt Instrument, Repurchase Amount											693,200,000
Scenario, Forecast \| Senior Notes [Member] \| 7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt Instrument, Face Amount											$ 1,000,000,000
Debt instrument, interest rate, stated percentage											7.75%
Scenario, Forecast \| Senior Notes [Member] \| 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount											$ 156,200,000
Debt Instrument, Repurchase Amount											159,300,000
Scenario, Forecast \| Senior Notes [Member] \| 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount											256,600,000
Debt Instrument, Repurchase Amount											277,100,000
Scenario, Forecast \| Senior Notes [Member] \| 8.50% Senior notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount											237,600,000	$ 55,000,000	$ 182,600,000
Debt Instrument, Repurchase Amount											$ 256,800,000
Exchange Offers [Member]
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)		3,500,000
Amortization of Debt Issuance Costs		$ 2,700,000
Exchange Offers [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount															$ 649,500,000
Debt Instrument, Repurchase Amount															664,500,000
Exchange Offers [Member] \| Senior Notes [Member] \| 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount															373,900,000
Debt Instrument, Repurchase Amount															362,500,000
Exchange Offers [Member] \| Senior Notes [Member] \| 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount															129,800,000
Debt Instrument, Repurchase Amount															138,700,000
Exchange Offers [Member] \| Senior Notes [Member] \| 8.50% Senior notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount															145,800,000
Debt Instrument, Repurchase Amount															163,300,000
Exchange Offers [Member] \| Senior Notes [Member] \| 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 332,000,000