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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Debt - Senior Unsecured Notes (Details) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Nov. 08, 2018	Jul. 16, 2018	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument
Principal balance on debt				$ 6,234,984,000		$ 6,234,984,000
Senior unsecured notes				5,262,694,000		5,262,694,000		$ 5,258,550,000
Loss on extinguishment of debt				1,135,000	$ 0	1,135,000	$ 0
Senior Unsecured Note
Debt Instrument
Principal balance on debt				5,300,000,000		5,300,000,000
Senior unsecured notes				0		0		$ 0
Senior Unsecured Note \| 2026 Notes
Debt Instrument
Face amount				$ 650,000,000		$ 650,000,000
Percentage of stated interest rate				3.25%		3.25%
Senior Unsecured Note \| 2029 Notes
Debt Instrument
Face amount				$ 650,000,000		$ 650,000,000
Percentage of stated interest rate				3.50%		3.50%
Senior Unsecured Note \| 2020 Notes
Debt Instrument
Face amount				$ 800,000,000		$ 800,000,000
Percentage of stated interest rate				2.625%		2.625%
Senior Unsecured Note \| 2023 Notes
Debt Instrument
Face amount				$ 250,000,000		$ 250,000,000
Percentage of stated interest rate				4.25%		4.25%
Senior Unsecured Note \| 2022 Notes
Debt Instrument
Face amount				$ 250,000,000		$ 250,000,000
Percentage of stated interest rate				4.00%		4.00%
Senior Unsecured Note \| Unsecured Note 5.375%
Debt Instrument
Percentage of stated interest rate		5.375%
Loss on extinguishment of debt		$ 44,000,000
Repayment of senior unsecured notes		$ 700,000,000
Senior Unsecured Note \| Unsecured Debt 3.750%
Debt Instrument
Percentage of stated interest rate	3.75%
Repayment of senior unsecured notes	$ 450,000,000
Subsequent Event \| Senior Unsecured Note \| Senior Notes Due 2020, 2022, and 2023
Debt Instrument
Loss on extinguishment of debt			$ (35,000,000)