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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. 22, 2019	Jul. 08, 2019	Nov. 08, 2018	Jul. 16, 2018	Jul. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 05, 2019	Dec. 31, 2018
Debt Instrument
Principal balance on debt						$ 6,549,877,000		$ 6,549,877,000
Senior unsecured notes						5,253,639,000		5,253,639,000			$ 5,258,550,000
Loss on extinguishment of debt						35,017,000	$ 43,899,000	36,152,000	$ 43,899,000
Senior Unsecured Note
Debt Instrument
Principal balance on debt						$ 5,300,000,000		$ 5,300,000,000
Senior unsecured notes											$ 0
Senior Unsecured Note \| 2026 Notes
Debt Instrument
Face amount										$ 650,000,000
Percentage of stated interest rate										3.25%
Senior Unsecured Note \| 2029 Notes
Debt Instrument
Face amount										$ 650,000,000
Percentage of stated interest rate										3.50%
Senior Unsecured Note \| 2020 Notes
Debt Instrument
Percentage of stated interest rate	2.625%					2.625%		2.625%
Repayment of senior unsecured notes	$ 800,000,000
Senior Unsecured Note \| 2022 Notes
Debt Instrument
Percentage of stated interest rate		4.00%				4.00%		4.00%
Repayment of senior unsecured notes		$ 250,000,000
Senior Unsecured Note \| 2023 Notes
Debt Instrument
Percentage of stated interest rate		4.25%				4.25%		4.25%
Repayment of senior unsecured notes		$ 250,000,000
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
Senior Unsecured Note \| Senior Notes Due 2020, 2022, and 2023
Debt Instrument
Loss on extinguishment of debt					$ (35,000,000)