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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