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Long-Term Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument Table [Line Items]    
Long-Term Debt $ 6,390,000,000 $ 6,990,000,000
Capital Lease Obligation 32,155,000 38,710,000
Less: Current Portion of Long-Term Debt 356,235,000 6,579,000
Unamortized Debt Discount 30,564,000 36,915,000
Debt Issuance Costs 4,520,000 5,437,000
Total Long-Term Debt 6,030,836,000 6,979,779,000
Long-Term Debt by Maturity [Abstract]    
Aggregate annual maturity of long-term debt (excluding capital lease obligations) in 2018 350,000,000  
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  
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) 2.56%  
Revolving Credit Agreement 2020 | Base Rate [Member]    
Line of Credit Facility [Line Items]    
Effective Interest Rate (in hundredths) 4.50%  
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
Long-term Commercial Paper, Noncurrent 0  
Average Borrowings Outstanding $ 84,000,000 $ 130,000,000
Short-term Debt, Weighted Average Interest Rate, over Time 1.44% 0.76%
5.10% Senior Notes Due 2036    
Debt Instrument Table [Line Items]    
Long-Term Debt $ 250,000,000 $ 250,000,000
Debt Instrument Issuance [Abstract]    
Debt Instrument Issuance Face Amount $ 250,000,000  
Debt Instrument Issuance Interest Rate 5.10%  
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
Senior Notes Due 2026 [Member]    
Debt Instrument Table [Line Items]    
Long-Term Debt 750,000,000 750,000,000
Debt Instrument Issuance [Abstract]    
Debt Instrument Issuance Face Amount $ 750,000,000  
Debt Instrument Issuance Interest Rate 4.15%  
3.90% Senior Notes due 2035    
Debt Instrument Table [Line Items]    
Long-Term Debt $ 500,000,000 500,000,000
2.500% Senior Notes due 2016    
Debt Instrument Issuance [Abstract]    
Debt Instrument Issuance Face Amount $ 400,000,000  
Debt Instrument Issuance Interest Rate 2.50%  
5.875% Senior Notes due 2017    
Debt Instrument Table [Line Items]    
Long-Term Debt $ 0 600,000,000
Debt Instrument Issuance [Abstract]    
Debt Instrument Issuance Face Amount $ 600,000,000  
Debt Instrument Issuance Interest Rate 5.88%  
6.875% Senior Notes due 2018    
Debt Instrument Table [Line Items]    
Long-Term Debt $ 350,000,000 350,000,000
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
6.65% Senior Notes due 2028    
Debt Instrument Table [Line Items]    
Long-Term Debt 140,000,000 $ 140,000,000
the New Notes    
Debt Instrument Issuance [Abstract]    
Net Proceeds From Issuance of Senior Long-Term Debt $ 991,000,000