Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-Term Debt	$ 5,640,000	$ 5,140,000
Capital Lease Obligation	212,217	57,900
Less: Current Portion of Long-Term Debt	781,054	1,014,524
Unamortized Debt Discount	30,931	19,528
Debt Issuance Costs	4,881	2,929
Total Long-Term Debt	5,035,351	4,160,919
Long-Term Debt by Maturity [Abstract]
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2021	750,000
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2022	0
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2023	1,250,000
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2024	0
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2025	500,000
Line of Credit Facility [Line Items]
Proceeds from Debt, Net of Issuance Costs	$ 1,480,000
Revolving Credit Agreement 2020
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Jul. 21, 2020
Maximum borrowing capacity	$ 2,000,000
Senior Unsecured Revolving Credit Agreement Due 2024 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Jun. 27, 2024
Line Of Credit Facility Increase Additional Borrowings	$ 3,000,000
Maximum borrowing capacity	$ 2,000,000
Maximum total debt-to-total capitalization ratio allowed under financial covenant (in hundredths)	65.00%
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 0	0
Senior Unsecured Revolving Credit Agreement Due 2024 [Member] \| Eurodollar [Member]
Line of Credit Facility [Line Items]
Effective Interest Rate (in hundredths)	1.04%
Senior Unsecured Revolving Credit Agreement Due 2024 [Member] \| Base Rate [Member]
Line of Credit Facility [Line Items]
Effective Interest Rate (in hundredths)	3.25%
Commercial Paper
Line of Credit Facility [Line Items]
Current Borrowings Outstanding	$ 0	0
4.40% Senior Notes Due 2020
Debt Instrument [Line Items]
Long-Term Debt	0	500,000
Debt Instrument Issuance Face Amount	$ 500,000
Debt Instrument Issuance Interest Rate	4.40%
2.45% Senior Notes due 2020
Debt Instrument [Line Items]
Long-Term Debt	$ 0	500,000
Debt Instrument Issuance Face Amount	$ 500,000
Debt Instrument Issuance Interest Rate	2.45%
4.100% Senior Notes due 2021
Debt Instrument [Line Items]
Long-Term Debt	$ 750,000	750,000
Debt Instrument Issuance Face Amount	$ 750,000
Debt Instrument Issuance Interest Rate	4.10%
2.625% Senior Notes due 2023
Debt Instrument [Line Items]
Long-Term Debt	$ 1,250,000	1,250,000
4.15% Senior Notes due 2026
Debt Instrument [Line Items]
Long-Term Debt	750,000	750,000
3.15% Senior Notes due 2025
Debt Instrument [Line Items]
Long-Term Debt	500,000	500,000
6.65% Senior Notes due 2028
Debt Instrument [Line Items]
Long-Term Debt	140,000	140,000
4.375% Senior Notes due 2030
Debt Instrument [Line Items]
Long-Term Debt	750,000	0
Debt Instrument Issuance Face Amount	$ 750,000
Debt Instrument Issuance Interest Rate	4.375%
3.90% Senior Notes due 2035
Debt Instrument [Line Items]
Long-Term Debt	$ 500,000	500,000
4.95% Senior Notes due 2050
Debt Instrument [Line Items]
Long-Term Debt	750,000	0
Debt Instrument Issuance Face Amount	$ 750,000
Debt Instrument Issuance Interest Rate	4.95%
5.10% Senior Notes due 2036
Debt Instrument [Line Items]
Long-Term Debt	$ 250,000	250,000
5.625% Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument Issuance Face Amount		$ 900,000
Debt Instrument Issuance Interest Rate		5.625%

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