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Long-Term Debt - Narrative (Details)		12 Months Ended
	Sep. 23, 2016 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 26, 2019 USD ($)	Aug. 28, 2018 USD ($)	Dec. 31, 2016	Dec. 19, 2016 USD ($)	Dec. 07, 2015 USD ($)	Nov. 21, 2012 USD ($)	Jul. 27, 2012 USD ($)	Sep. 30, 2009 USD ($)
Debt Instrument [Line Items]
Payment of senior notes		$ 0	$ 1,300,000,000.0	$ 400,000,000.0
Loss on extinguishment of debt		0	15,900,000	$ 0
Outstanding letters of credit		74,000,000.0
Other
Debt Instrument [Line Items]
Face amount of debt		7,700,000
Credit facility | 2016 Facility
Debt Instrument [Line Items]
Debt term	5 years
Additional borrowing capacity available	$ 500,000,000.0
Outstanding borrowings		0.0
Consolidated total leverage ratio	3.50
Credit facility | 2016 Facility | Through June 30, 2017
Debt Instrument [Line Items]
Consolidated total leverage ratio							4.25
Credit facility | 2016 Facility | Through December 31, 2017
Debt Instrument [Line Items]
Consolidated total leverage ratio							4.00
Credit facility | 2016 Facility | Minimum
Debt Instrument [Line Items]
Consolidated total leverage ratio, potential higher ratio	4.00
Credit facility | 2016 Facility | Maximum
Debt Instrument [Line Items]
Consolidated total leverage ratio, potential higher ratio	4.25
Credit facility | 2012 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 1,850,000,000
Credit facility | Revolving credit facility | 2016 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,500,000,000
Credit facility | Letter of credit | 2016 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150,000,000.0
Senior notes
Debt Instrument [Line Items]
Face amount of debt		$ 5,300,000,000
Redemption price percentage		100.00%
Senior notes | $500 2.350% senior notes due 2024
Debt Instrument [Line Items]
Face amount of debt		$ 500,000,000			$ 500,000,000.0
Interest rate		2.35%			2.35%
Senior notes | $700 2.950% senior notes due 2029
Debt Instrument [Line Items]
Face amount of debt		$ 700,000,000			$ 700,000,000.0
Interest rate		2.95%			2.95%
Senior notes | $700 3.650% senior notes due 2023
Debt Instrument [Line Items]
Face amount of debt		$ 700,000,000				$ 700,000,000.0
Interest rate		3.65%				3.65%
Senior notes | $800 4.200% senior notes due 2028
Debt Instrument [Line Items]
Face amount of debt		$ 800,000,000				$ 800,000,000.0
Interest rate		4.20%				4.20%
Senior notes | $500 2.800% senior notes due 2021
Debt Instrument [Line Items]
Face amount of debt		$ 500,000,000						$ 500,000,000.0
Interest rate		2.80%						2.80%
Senior notes | $700 3.800% senior notes due 2026
Debt Instrument [Line Items]
Face amount of debt		$ 700,000,000						$ 700,000,000.0
Interest rate		3.80%						3.80%
Senior notes | $600 3.000% senior notes due 2020
Debt Instrument [Line Items]
Face amount of debt		$ 600,000,000							$ 600,000,000.0
Interest rate		3.00%							3.00%
Senior notes | $300 3.850% senior notes due 2025
Debt Instrument [Line Items]
Face amount of debt		$ 300,000,000							$ 300,000,000.0
Interest rate		3.85%							3.85%
Senior notes | $500 3.125% senior notes due 2022
Debt Instrument [Line Items]
Face amount of debt		$ 500,000,000								$ 500,000,000.0
Interest rate		3.125%								3.125%
Senior notes | $500 6.250% senior notes due 2019
Debt Instrument [Line Items]
Face amount of debt												$ 500,000,000.0
Interest rate												6.25%
Payment of senior notes			500,000,000.0
Loss on extinguishment of debt			$ 15,900,000

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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