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Long-Term Debt - Narrative (Details) - USD ($)			12 Months Ended
	Nov. 15, 2020	Sep. 02, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 01, 2020	Jun. 22, 2020	Aug. 26, 2019	Aug. 28, 2018	Dec. 19, 2016	Sep. 23, 2016	Dec. 07, 2015	Nov. 21, 2012	Sep. 30, 2009
Debt Instrument [Line Items]
Redemption of senior notes			$ 600,000,000.0	$ 0	$ 1,300,000,000.0
Loss on extinguishment of debt			0	$ 0	15,900,000
Outstanding letters of credit			67,100,000
Other
Debt Instrument [Line Items]
Face amount of debt			6,200,000
Credit facility | Unsecured credit facility
Debt Instrument [Line Items]
Outstanding borrowings			1,620,000,000.0
Senior notes
Debt Instrument [Line Items]
Face amount of debt			$ 8,000,000,000
Redemption price percentage			100.00%
Senior notes | Senior Notes Due June 2030
Debt Instrument [Line Items]
Face amount of debt							$ 600,000,000.0
Interest rate							2.00%
Senior notes | Senior Notes Due August 2022
Debt Instrument [Line Items]
Face amount of debt						$ 300,000,000.0
Interest rate						0.45%
Senior notes | Senior Notes Due September 2025
Debt Instrument [Line Items]
Face amount of debt						$ 700,000,000.0
Interest rate						1.00%
Senior notes | Senior Notes Due September 2027
Debt Instrument [Line Items]
Face amount of debt						$ 700,000,000.0
Interest rate						1.40%
Senior notes | Senior Notes Due February 2031
Debt Instrument [Line Items]
Face amount of debt						$ 1,000,000,000.0
Interest rate						1.75%
Senior notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Face amount of debt								$ 500,000,000.0
Interest rate								2.35%
Senior notes | Senior Notes Due 2029
Debt Instrument [Line Items]
Face amount of debt								$ 700,000,000.0
Interest rate								2.95%
Senior notes | Senior Notes Due 2023
Debt Instrument [Line Items]
Face amount of debt									$ 700,000,000.0
Interest rate									3.65%
Senior notes | Senior Notes Due 2028
Debt Instrument [Line Items]
Face amount of debt									$ 800,000,000.0
Interest rate									4.20%
Senior notes | Senior Notes 2021
Debt Instrument [Line Items]
Face amount of debt										$ 500,000,000.0
Interest rate										2.80%
Senior notes | Senior Notes 2026
Debt Instrument [Line Items]
Face amount of debt										$ 700,000,000.0
Interest rate										3.80%
Senior notes | Senior Notes 2020
Debt Instrument [Line Items]
Face amount of debt												$ 600,000,000.0
Interest rate	3.00%											3.00%
Redemption of senior notes	$ 600,000,000.0
Senior notes | Senior Notes 2025
Debt Instrument [Line Items]
Face amount of debt												$ 300,000,000.0
Interest rate												3.85%
Senior notes | Senior Notes 2022
Debt Instrument [Line Items]
Face amount of debt													$ 500,000,000.0
Interest rate													3.125%
Senior notes | Senior Notes 2019
Debt Instrument [Line Items]
Face amount of debt														$ 500,000,000.0
Interest rate														6.25%
Redemption of senior notes					500,000,000.0
Loss on extinguishment of debt					$ 15,900,000
JPMORGAN CHASE BANK N.A. | Revolving credit facility
Debt Instrument [Line Items]
Debt term		3 years
Maximum borrowing capacity		$ 3,000,000,000.0									$ 2,500,000,000.0
Potential increase limit		$ 500,000,000.0
Fee percentage on outstanding letters of credit		1.125%
Fee percentage on undrawn amounts		0.125%
Total Debt to Total Capital Ratio, minimum required		0.65
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario One | NYFRB Rate
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.50%
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario One | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.00%
Interest rate floor		0.00%
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario One | Current Variable Rate In Effect
Debt Instrument [Line Items]
Basis spread based on current rating			0.125%
JPMORGAN CHASE BANK N.A. | Revolving credit facility | Interest Rate Scenario Two | Eurodollar
Debt Instrument [Line Items]
Interest rate floor		0.00%
Basis spread based on current rating			1.125%
JPMORGAN CHASE BANK N.A. | Letter of credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 150,000,000.0
Fee percentage on undrawn amounts		0.125%

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