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Debt - Senior Unsecured Notes (Details) - USD ($)								3 Months Ended	12 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Nov. 21, 2019	Jul. 22, 2019	Jul. 08, 2019	Nov. 08, 2018	Jul. 16, 2018	Jul. 27, 2017	May 01, 2017	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 05, 2019
Debt Instrument [Line Items]
Long-term debt, gross								$ 6,307,244,000	$ 6,307,244,000
Senior unsecured notes								5,647,993,000	5,647,993,000	$ 5,258,550,000
Loss on extinguishment of debt									58,364,000	44,162,000	$ 54,227,000
Unsecured Note 4.000%
Debt Instrument [Line Items]
Repayment of senior unsecured notes	$ 350,000,000		$ 250,000,000
Interest rate (as a percent)	4.00%		4.00%
Loss on extinguishment of debt								35,000,000	22,000,000
Unsecured Note 5.375 Percent [Member]
Debt Instrument [Line Items]
Repayment of senior unsecured notes					$ 700,000,000	$ 500,000,000
Interest rate (as a percent)					5.375%	5.375%
Loss on extinguishment of debt										44,000,000	54,000,000
Senior Unsecured Debt 5.625%
Debt Instrument [Line Items]
Repayment of senior unsecured notes		$ 800,000,000					$ 250,000,000
Interest rate (as a percent)		2.625%					5.625%
Unsecured Note 4.250 Percent
Debt Instrument [Line Items]
Repayment of senior unsecured notes			$ 250,000,000
Interest rate (as a percent)			4.25%
Unsecured Note 3.750 Percent
Debt Instrument [Line Items]
Repayment of senior unsecured notes				$ 450,000,000
Interest rate (as a percent)				3.75%
Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross								$ 5,700,000,000	$ 5,700,000,000
Senior unsecured notes										$ 0	$ 0
Unsecured Debt \| Senior Unsecured Notes Due 2030
Debt Instrument [Line Items]
Face amount	$ 750,000,000
Interest rate (as a percent)	3.00%
Unsecured Debt \| Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Face amount												$ 650,000,000
Interest rate (as a percent)												3.25%
Unsecured Debt \| Senior Unsecured Notes Due 2029
Debt Instrument [Line Items]
Face amount												$ 650,000,000
Interest rate (as a percent)												3.50%
Unsecured Debt \| Senior Unsecured Notes Due 2020
Debt Instrument [Line Items]
Interest rate (as a percent)								2.625%	2.625%
Unsecured Debt \| Senior Notes Due 2023
Debt Instrument [Line Items]
Interest rate (as a percent)								4.25%	4.25%
Unsecured Debt \| Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate (as a percent)								4.00%	4.00%