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

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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
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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt - Senior Unsecured Notes (Details) - USD ($)						3 Months Ended		12 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Jul. 27, 2017	May 01, 2017	Nov. 30, 2016	Sep. 15, 2016	Feb. 01, 2016	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, gross								$ 7,834,317,000
Loss on debt extinguishments							$ (46,000,000)	(54,227,000)	$ (46,020,000)	$ 0
Senior unsecured notes							7,133,538,000	6,396,451,000	7,133,538,000
Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross								$ 6,450,000,000
Interest rate (as a percent)
Senior unsecured notes							$ 0	$ 0	0
Senior Unsecured Debt 5.625%
Debt Instrument [Line Items]
Repayment of senior unsecured notes		$ 250,000,000				$ 500,000,000
Interest rate (as a percent)		5.625%				5.375%
Loss on debt extinguishments						$ (54,000,000)		$ (54,000,000)	$ (46,000,000)
Senior Unsecured Debt 5.375%
Debt Instrument [Line Items]
Repayment of senior unsecured notes	$ 500,000,000
Interest rate (as a percent)	5.375%
Senior Unsecured Debt 3.75 %
Debt Instrument [Line Items]
Repayment of senior unsecured notes					$ 500,000,000
Interest rate (as a percent)					3.75%
Senior Unsecured Debt 6.30%
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%
Senior Unsecured Debt 6.700%
Debt Instrument [Line Items]
Repayment of senior unsecured notes			$ 600,000,000
Interest rate (as a percent)			6.70%