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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)	Dec. 31, 2020	Nov. 15, 2020	Sep. 01, 2020	Jun. 22, 2020	Dec. 31, 2019	Aug. 26, 2019	Aug. 28, 2018	Dec. 19, 2016	Dec. 07, 2015	Nov. 21, 2012
Debt Instrument [Line Items]
Total debt	$ 9,566,500,000				$ 5,275,300,000
Less current portion	502,000,000.0				602,200,000
Long-term debt	9,064,500,000				4,673,100,000
Other
Debt Instrument [Line Items]
Face amount of debt	6,200,000
Credit facility | Unsecured credit facility
Debt Instrument [Line Items]
Long-term debt	1,620,000,000.0				0
Senior notes
Debt Instrument [Line Items]
Less unamortized debt issuance costs	(59,700,000)				(32,400,000)
Face amount of debt	8,000,000,000
Senior notes | $600 3.000% senior notes due 2020
Debt Instrument [Line Items]
Long-term debt	0				600,000,000.0
Face amount of debt									$ 600,000,000.0
Interest rate		3.00%							3.00%
Senior notes | $600 3.000% senior notes due 2020 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 600,000,000
Interest rate	3.00%
Senior notes | $500 2.800% senior notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 500,000,000.0				500,000,000.0
Face amount of debt								$ 500,000,000.0
Interest rate								2.80%
Senior notes | $500 2.800% senior notes due 2021 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 500,000,000
Interest rate	2.80%
Senior notes | $500 3.125% senior notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 500,000,000.0				500,000,000.0
Face amount of debt										$ 500,000,000.0
Interest rate										3.125%
Senior notes | $500 3.125% senior notes due 2022 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 500,000,000
Interest rate	3.125%
Senior notes | $300 0.450% senior notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 300,000,000.0				0
Face amount of debt			$ 300,000,000.0
Interest rate			0.45%
Senior notes | $300 0.450% senior notes due 2022 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 300,000,000
Interest rate	0.45%
Senior notes | $700 3.650% senior notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 700,000,000.0				700,000,000.0
Face amount of debt							$ 700,000,000.0
Interest rate							3.65%
Senior notes | $700 3.650% senior notes due 2023 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 700,000,000
Interest rate	3.65%
Senior notes | $500 2.350% senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 500,000,000.0				500,000,000.0
Face amount of debt						$ 500,000,000.0
Interest rate						2.35%
Senior notes | $500 2.350% senior notes due 2024 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 500,000,000
Interest rate	2.35%
Senior notes | $300 3.850% senior notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 300,000,000.0				300,000,000.0
Face amount of debt									$ 300,000,000.0
Interest rate									3.85%
Senior notes | $300 3.850% senior notes due 2025 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 300,000,000
Interest rate	3.85%
Senior notes | $700 1.000% senior notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 700,000,000.0				0
Face amount of debt			$ 700,000,000.0
Interest rate			1.00%
Senior notes | $700 1.000% senior notes due 2025 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 700,000,000
Interest rate	1.00%
Senior notes | $700 3.800% senior notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 700,000,000.0				700,000,000.0
Face amount of debt								$ 700,000,000.0
Interest rate								3.80%
Senior notes | $700 3.800% senior notes due 2026 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 700,000,000
Interest rate	3.80%
Senior notes | $700 1.400% senior notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 700,000,000.0				0
Face amount of debt			$ 700,000,000.0
Interest rate			1.40%
Senior notes | $700 1.400% senior notes due 2027 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 700,000,000
Interest rate	1.40%
Senior notes | $800 4.200% senior notes due 2028
Debt Instrument [Line Items]
Long-term debt	$ 800,000,000.0				800,000,000.0
Face amount of debt							$ 800,000,000.0
Interest rate							4.20%
Senior notes | $800 4.200% senior notes due 2028 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 800,000,000
Interest rate	4.20%
Senior notes | $700 2.950% senior notes due 2029
Debt Instrument [Line Items]
Long-term debt	$ 700,000,000.0				700,000,000.0
Face amount of debt						$ 700,000,000.0
Interest rate						2.95%
Senior notes | $700 2.950% senior notes due 2029 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 700,000,000
Interest rate	2.95%
Senior notes | $600 2.000% senior notes due 2030
Debt Instrument [Line Items]
Long-term debt	$ 600,000,000.0				0
Face amount of debt				$ 600,000,000.0
Interest rate				2.00%
Senior notes | $600 2.000% senior notes due 2030 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 600,000,000
Interest rate	2.00%
Senior notes | $1,000 1.750% senior notes due 2031
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000,000.0				0
Face amount of debt			$ 1,000,000,000.0
Interest rate			1.75%
Senior notes | $1,000 1.750% senior notes due 2031 | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Face amount of debt	$ 1,000,000,000
Interest rate	1.75%
Senior notes | Other
Debt Instrument [Line Items]
Long-term debt	$ 6,200,000				$ 7,700,000

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