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Long-Term Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument Table [Line Items]    
Long-Term Debt $ 6,040,000,000 $ 6,390,000,000
Capital Lease Obligation 71,571,000 32,155,000
Less: Current Portion of Long-Term Debt 913,093,000 356,235,000
Unamortized Debt Discount 24,640,000 30,564,000
Debt Issuance Costs 3,669,000 4,520,000
Total Long-Term Debt 5,170,169,000 6,030,836,000
Long-Term Debt by Maturity [Abstract]    
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2019 900,000,000  
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  
Revolving Credit Agreement 2020    
Line of Credit Facility [Line Items]    
Current Borrowings Outstanding 0  
Average Borrowings Outstanding $ 0  
Line of Credit Facility, Expiration Date Jul. 21, 2020  
Maximum borrowing capacity $ 2,000,000,000  
Maximum total debt-to-total capitalization ratio allowed under financial covenant (in hundredths) 65.00%  
Revolving Credit Agreement 2020 | Eurodollar [Member]    
Line of Credit Facility [Line Items]    
Effective Interest Rate (in hundredths) 3.50%  
Revolving Credit Agreement 2020 | Base Rate [Member]    
Line of Credit Facility [Line Items]    
Effective Interest Rate (in hundredths) 5.50%  
Uncommitted Credit Facilities    
Line of Credit Facility [Line Items]    
Current Borrowings Outstanding $ 0 0
Commercial Paper    
Line of Credit Facility [Line Items]    
Current Borrowings Outstanding 0 0
Average Borrowings Outstanding $ 8,000,000 $ 84,000,000
Short-term Debt, Weighted Average Interest Rate, over Time 1.97% 1.44%
6.875% Senior Notes due 2018    
Debt Instrument Table [Line Items]    
Long-Term Debt $ 0 $ 350,000,000
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 $ 900,000,000 900,000,000
4.40% Senior Notes due 2020    
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
5.875% Senior Notes due 2017    
Debt Instrument Issuance [Abstract]    
Debt Instrument Issuance Face Amount $ 600,000,000  
Debt Instrument Issuance Interest Rate 5.875%