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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Debt - Senior Unsecured Notes (Details) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Jul. 16, 2018	Jul. 27, 2017	May 01, 2017	Nov. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument
Principal balance on debt					$ 6,744,490,000		$ 6,744,490,000
Loss on extinguishment of debt					43,899,000	$ 54,227,000	43,899,000	$ 54,227,000
Senior unsecured notes					5,706,181,000		5,706,181,000		$ 6,396,451,000
Senior Unsecured Note
Debt Instrument
Principal balance on debt					5,750,000,000		5,750,000,000
Senior unsecured notes					$ 0		$ 0		$ 0
Senior Unsecured Note \| Forecast
Debt Instrument
Percentage of stated interest rate				3.75%
Loss on extinguishment of debt				$ 0
Gross amount of debt redemption				$ 450,000,000
Senior Unsecured Note \| Unsecured Note 5.625%
Debt Instrument
Repayment of senior unsecured notes	$ 700,000,000		$ 250,000,000
Percentage of stated interest rate	5.375%		5.625%
Senior Unsecured Note \| Unsecured Note 5.375% Due 2021
Debt Instrument
Loss on extinguishment of debt	$ 44,000,000
Senior Unsecured Note \| Unsecured Note 5.375%
Debt Instrument
Repayment of senior unsecured notes		$ 500,000,000
Percentage of stated interest rate		5.375%
Loss on extinguishment of debt		$ 54,000,000