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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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt - Senior Unsecured Notes (Details) - USD ($)			1 Months Ended	6 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Jul. 27, 2017	May 01, 2017	Jul. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument
Principal balance on debt				$ 7,353,401,000
Senior unsecured notes				6,401,502,000	$ 6,396,451,000
Unsecured Debt
Debt Instrument
Principal balance on debt				6,450,000,000
Senior unsecured notes				0	$ 0
Repayments of debt				$ 0
Unsecured Note 5.625%
Debt Instrument
Repayment of senior unsecured notes		$ 250,000,000
Percentage of stated interest rate		5.625%
Unsecured Note 5.375%
Debt Instrument
Repayment of senior unsecured notes	$ 500,000,000
Percentage of stated interest rate	5.375%
Subsequent Event \| Senior Notes \| Unsecured Note 5.375% Due 2021
Debt Instrument
Percentage of stated interest rate			5.375%
Repayments of debt			$ 700,000,000
Loss on debt extinguishments			$ 44,000,000