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Debt - Senior Unsecured Notes (Details) - USD ($)						1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 09, 2020	Jun. 24, 2020	Nov. 21, 2019	Jul. 22, 2019	Jul. 16, 2018	Jan. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 23, 2020	Jul. 08, 2019	Jul. 05, 2019	Nov. 08, 2018
Debt Instrument [Line Items]
Long-term debt, gross								$ 6,346,370,000
Senior unsecured notes								5,697,586,000	$ 5,647,993,000
Loss on debt extinguishments								42,912,000	$ 58,364,000	$ 44,162,000
Unsecured Note 4.250 Percent
Debt Instrument [Line Items]
Face amount												$ 250,000,000
Interest rate (as a percent)												4.25%
Unsecured Note 4.000%
Debt Instrument [Line Items]
Face amount			$ 350,000,000									$ 250,000,000
Interest rate (as a percent)			4.00%									4.00%
Loss on debt extinguishments			$ 22,000,000	$ 35,000,000
Senior Unsecured Debt 2.63%
Debt Instrument [Line Items]
Face amount				$ 800,000,000
Interest rate (as a percent)				2.63%
Unsecured Note 3.750 Percent
Debt Instrument [Line Items]
Face amount														$ 450,000,000
Interest rate (as a percent)														3.75%
Unsecured Note 5.375 Percent
Debt Instrument [Line Items]
Face amount					$ 700,000,000
Interest rate (as a percent)					5.38%
Loss on debt extinguishments					$ 44,000,000
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross								$ 5,750,000,000
Senior unsecured notes										$ 0
Senior Unsecured Notes | Subsequent Event
Debt Instrument [Line Items]
Loss on debt extinguishments							$ 90,000,000
Senior Unsecured Notes | Senior Unsecured Notes Due 2031
Debt Instrument [Line Items]
Face amount											$ 600,000,000
Interest rate (as a percent)											2.88%
Senior Unsecured Notes | Senior Unsecured Notes Due 2030
Debt Instrument [Line Items]
Face amount			$ 750,000,000
Interest rate (as a percent)			3.00%
Senior Unsecured Notes | Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Face amount													$ 650,000,000
Interest rate (as a percent)													3.25%
Senior Unsecured Notes | Senior Unsecured Notes Due 2029
Debt Instrument [Line Items]
Face amount													$ 650,000,000
Interest rate (as a percent)													3.50%
Senior Unsecured Notes | Unsecured Note 3.15 Percent
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Interest rate (as a percent)	3.15%
Loss on debt extinguishments	$ 18,000,000
Senior Unsecured Notes | Unsecured Note 4.250 Percent
Debt Instrument [Line Items]
Face amount		$ 250,000,000
Interest rate (as a percent)		4.25%										4.25%
Loss on debt extinguishments		$ 26,000,000
Senior Unsecured Notes | Unsecured Note 4.000%
Debt Instrument [Line Items]
Interest rate (as a percent)			4.00%	4.00%
Senior Unsecured Notes | Senior Unsecured Debt 2.63%
Debt Instrument [Line Items]
Interest rate (as a percent)				2.63%
Senior Unsecured Notes | Unsecured Note 5.375 Percent
Debt Instrument [Line Items]
Interest rate (as a percent)					5.38%
Senior Unsecured Notes | Senior Notes Due 2023 | Subsequent Event
Debt Instrument [Line Items]
Interest rate (as a percent)						4.25%
Repayment of senior unsecured notes						$ 112,000,000
Senior Unsecured Notes | Senior Unsecured Notes Due 2024 | Subsequent Event
Debt Instrument [Line Items]
Interest rate (as a percent)						4.20%
Repayment of senior unsecured notes						$ 201,000,000
Senior Unsecured Notes | 3.88% Senior Unsecured Notes Due 2024 | Subsequent Event
Debt Instrument [Line Items]
Interest rate (as a percent)						3.88%
Repayment of senior unsecured notes						$ 469,000,000

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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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