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Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | $ 5,140,000,000 | $ 6,040,000,000 |
Capital Lease Obligation | 57,900,000 | 71,571,000 |
Less: Current Portion of Long-Term Debt | 1,014,524,000 | 913,093,000 |
Unamortized Debt Discount | 19,528,000 | 24,640,000 |
Debt Issuance Costs | 2,929,000 | 3,669,000 |
Total Long-Term Debt | 4,160,919,000 | 5,170,169,000 |
Long-Term Debt by Maturity [Abstract] |  |  |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2020 | 1,000,000,000 |  |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2021 | 750,000,000 |  |
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 | 1,250,000,000 |  |
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2024 | 0 |  |
Revolving Credit Agreement 2020 |  |  |
Line of Credit Facility [Line Items] |  |  |
Average Borrowings Outstanding | $ 0 |  |
Line of Credit Facility, Expiration Date | Jun. 27, 2024 |  |
Line Of Credit Facility Increase Additional Borrowings | $ 3,000,000,000.0 |  |
Maximum borrowing capacity | $ 2,000,000,000.0 |  |
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 |  |
Revolving Credit Agreement 2020 | Eurodollar [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Effective Interest Rate (in hundredths) | 2.66% |  |
Revolving Credit Agreement 2020 | Base Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Effective Interest Rate (in hundredths) | 4.75% |  |
Senior Unsecured Revolving Credit Agreement Due 2020 [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Expiration Date | Jul. 21, 2020 |  |
Maximum borrowing capacity | $ 2,000,000,000.0 |  |
Line of Credit Facility, Maximum Amount Outstanding During Period |  | $ 0 |
Uncommitted Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Current Borrowings Outstanding |  |  | $ 0
Commercial Paper |  |  |
Line of Credit Facility [Line Items] |  |  |
Current Borrowings Outstanding |  |  | $ 0
Short-term Debt, Weighted Average Interest Rate, over Time |  | 1.97% |
Line of Credit Facility, Maximum Amount Outstanding During Period | 0 | $ 8,000,000 |
6.875% Senior Notes due 2018 |  |  |
Debt Instrument Issuance [Abstract] |  |  |
Debt Instrument Issuance Face Amount |  | $ 350,000,000 |
Debt Instrument Issuance Interest Rate |  | 6.875% |
5.625% Senior Notes due 2019 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 0 | $ 900,000,000 |
Debt Instrument Issuance [Abstract] |  |  |
Debt Instrument Issuance Face Amount | $ 900,000,000 |  |
Debt Instrument Issuance Interest Rate | 5.625% |  |
4.40% Senior Notes Due 2020 [Member] |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | $ 500,000,000 | 500,000,000 |
2.45% Senior Notes due 2020 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 500,000,000 | 500,000,000 |
4.100% Senior Notes due 2021 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 750,000,000 | 750,000,000 |
2.625% Senior Notes due 2023 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 1,250,000,000 | 1,250,000,000 |
3.15% Senior Notes due 2025 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 500,000,000 | 500,000,000 |
4.15% Senior Notes due 2026 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 750,000,000 | 750,000,000 |
6.65% Senior Notes due 2028 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 140,000,000 | 140,000,000 |
3.90% Senior Notes due 2035 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | 500,000,000 | 500,000,000 |
5.10% Senior Notes Due 2036 |  |  |
Debt Instrument Table [Line Items] |  |  |
Long-Term Debt | $ 250,000,000 | $ 250,000,000 |

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