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Debt - Senior Unsecured Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
Debt - Senior Unsecured Notes (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jul. 12, 2021	May 19, 2021	Feb. 26, 2021	Jan. 28, 2021	Jul. 09, 2020	Jun. 24, 2020	Jun. 23, 2020
Debt Instrument
Principal balance on debt	$ 5,578,596,000		$ 5,578,596,000
Loss on extinguishment of debt	667,000	$ 17,921,000	225,824,000	$ 42,912,000
Senior Unsecured Note
Debt Instrument
Principal balance on debt	$ 4,200,000,000		4,200,000,000
Senior Unsecured Note \| Unsecured Note 3.400 Percent
Debt Instrument
Amount						$ 251,806,000
Coupon Rate						3.40%
Senior Unsecured Note \| Unsecured Note 4.000 Percent
Debt Instrument
Amount						$ 298,194,000
Coupon Rate						4.00%
Senior Unsecured Note \| Unsecured Note 4.250 Percent
Debt Instrument
Amount							$ 188,000,000	$ 112,000,000		$ 250,000,000
Coupon Rate							4.25%	4.25%		4.25%
Loss on extinguishment of debt				26,000,000
Senior Unsecured Note \| Unsecured Note 4.200 Percent
Debt Instrument
Amount							$ 149,000,000	$ 201,000,000
Coupon Rate							4.20%	4.20%
Senior Unsecured Note \| Unsecured Note 3.880 Percent
Debt Instrument
Amount							$ 331,000,000	$ 469,000,000
Coupon Rate							3.88%	3.88%
Senior Unsecured Note \| Senior Notes Due 2025
Debt Instrument
Loss on extinguishment of debt			61,000,000
Senior Unsecured Note \| Senior Notes Due 2023 and 2024
Debt Instrument
Loss on extinguishment of debt			$ 164,000,000
Senior Unsecured Note \| 2031 Notes
Debt Instrument
Amount											$ 600,000,000
Coupon Rate											2.88%
Senior Unsecured Note \| Unsecured note 3.150 percent
Debt Instrument
Amount					$ 450,000,000				$ 300,000,000
Coupon Rate					1.35%				3.15%
Loss on extinguishment of debt		$ 18,000,000		$ 18,000,000