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.

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

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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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Debt - Senior Unsecured Notes (Details) - USD ($)	3 Months Ended							12 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 5,513,437,000							$ 5,513,437,000
Loss on extinguishment of debt								44,162,000	$ 54,227,000	$ 46,020,000
Senior unsecured notes	5,258,550,000							$ 5,258,550,000	6,396,451,000
Senior Unsecured Debt 5.375%
Debt Instrument [Line Items]
Repayment of senior unsecured notes		$ 700,000,000	$ 500,000,000
Interest rate (as a percent)		5.375%	5.375%
Loss on extinguishment of debt		$ 44,000,000
Senior Unsecured Debt 3.75 %
Debt Instrument [Line Items]
Repayment of senior unsecured notes	$ 450,000,000						$ 500,000,000
Interest rate (as a percent)	3.75%						3.75%	3.75%
Senior Unsecured Debt 5.625%
Debt Instrument [Line Items]
Repayment of senior unsecured notes				$ 250,000,000
Interest rate (as a percent)				5.625%
Loss on extinguishment of debt			$ 54,000,000
Senior Unsecured Debt 6.300%
Debt Instrument [Line Items]
Repayment of senior unsecured notes						$ 400,000,000
Interest rate (as a percent)						6.30%
Senior Unsecured Debt 6.000%
Debt Instrument [Line Items]
Repayment of senior unsecured notes					$ 500,000,000
Interest rate (as a percent)					6.00%					6.00%
Loss on extinguishment of debt					$ 46,000,000
Senior Unsecured Debt 6.700%
Debt Instrument [Line Items]
Repayment of senior unsecured notes					$ 600,000,000
Interest rate (as a percent)					6.70%					6.70%
Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 5,300,000,000							$ 5,300,000,000
Interest rate (as a percent)
Senior unsecured notes	$ 0				$ 0			$ 0	$ 0	$ 0