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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 06, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
[1]
Dec. 31, 2016
Apr. 24, 2017
Feb. 24, 2017
Sep. 20, 2016
Aug. 27, 2015
Debt Instrument [Line Items]                  
Debt   $ 7,100,000,000 $ 7,114,000,000   $ 7,114,000,000        
Unamortized Discount   (22,000,000) (23,000,000)   (23,000,000)        
Debt Instrument, Unamortized Premium   15,000,000 17,000,000   17,000,000        
Total Debt, Net of Discount   7,061,000,000 7,074,000,000   7,074,000,000        
Capital Lease Obligations, Current   (66,000,000) (63,000,000)   (63,000,000)        
Long-term Debt Due After One Year   6,995,000,000 7,011,000,000   7,011,000,000        
Gain on tendered offers   0   $ 80,000,000          
Repayments     850,000,000            
Leviathan Term Loan                  
Debt Instrument [Line Items]                  
Debt   $ 0 $ 0   $ 0        
Debt stated rate   0.00% 0.00%   0.00%        
Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Debt   $ 550,000,000 $ 550,000,000   $ 550,000,000        
Debt stated rate   2.20% 2.01%   2.01%        
Debt instrument, maturity date   Jan. 06, 2019              
Maximum borrowing capacity     $ 1,400,000,000   $ 1,400,000,000        
Line of Credit                  
Debt Instrument [Line Items]                  
Debt   $ 0 $ 0   $ 0        
Debt stated rate   0.00% 0.00%   0.00%        
Debt instrument, maturity date   Aug. 27, 2020     Aug. 27, 2020        
Maximum borrowing capacity   $ 4,000,000,000              
Credit facility fee rate basis points, minimum                 0.10%
Credit facility fee rate basis points, maximum                 0.25%
Credit facility interest rate, Eurodollar rate plus, minimum                 0.90%
Credit facility interest rate, Eurodollar rate plus, maximum                 1.50%
Noble Midstream Services Revolving Credit Facility, due September 20, 2021                  
Debt Instrument [Line Items]                  
Debt   $ 0 $ 0   $ 0        
Debt stated rate   0.00% 0.00%   0.00%        
Capital Lease and Other Obligations                  
Debt Instrument [Line Items]                  
Debt   $ 361,000,000 $ 375,000,000   $ 375,000,000        
Debt stated rate   0.00% 0.00%   0.00%        
Capital Lease Obligations, Current   $ (66,000,000) $ (63,000,000)   $ (63,000,000)        
8.25% Senior Notes, due March 1, 2019                  
Debt Instrument [Line Items]                  
Debt   $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000        
Debt stated rate   8.25% 8.25%   8.25%        
Debt instrument, maturity date   Mar. 01, 2019     Mar. 01, 2019        
5.625% Senior Notes, due May 1, 2021                  
Debt Instrument [Line Items]                  
Debt   $ 379,000,000 $ 379,000,000   $ 379,000,000        
Debt stated rate   5.625% 5.625%   5.625%        
Debt instrument, maturity date   May 01, 2021     May 01, 2021        
4.15% Senior Notes, due December 15, 2021                  
Debt Instrument [Line Items]                  
Debt   $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000        
Debt stated rate   4.15% 4.15%   4.15%        
Debt instrument, maturity date   Dec. 15, 2021     Dec. 15, 2021        
5.875% Senior Notes, due June 1, 2022                  
Debt Instrument [Line Items]                  
Debt   $ 18,000,000 $ 18,000,000   $ 18,000,000        
Debt stated rate   5.875% 5.875%   5.875%        
Debt instrument, maturity date   Jun. 01, 2022     Jun. 01, 2022        
7.25% Senior Notes, due October 15, 2023                  
Debt Instrument [Line Items]                  
Debt   $ 100,000,000 $ 100,000,000   $ 100,000,000        
Debt stated rate   7.25% 7.25%   7.25%        
Debt instrument, maturity date   Oct. 15, 2023     Oct. 15, 2023        
Unamortized Debt Issuance Expense   $ (32,000,000) $ (34,000,000)   $ (34,000,000)        
5.875% Senior Notes, due June 1, 2024                  
Debt Instrument [Line Items]                  
Debt   $ 8,000,000 $ 8,000,000   $ 8,000,000        
Debt stated rate   5.875% 5.875%   5.875%        
Debt instrument, maturity date   Jun. 01, 2024     Jun. 01, 2024        
3.90% Senior Notes, due November 15, 2024                  
Debt Instrument [Line Items]                  
Debt   $ 650,000,000 $ 650,000,000   $ 650,000,000        
Debt stated rate   3.90% 3.90%   3.90%        
Debt instrument, maturity date   Nov. 15, 2024     Nov. 15, 2024        
8.00% Senior Notes, due April 1, 2027                  
Debt Instrument [Line Items]                  
Debt   $ 250,000,000 $ 250,000,000   $ 250,000,000        
Debt stated rate   8.00% 8.00%   8.00%        
Debt instrument, maturity date   Apr. 01, 2027     Apr. 01, 2027        
6.00% Senior Notes, due March 1, 2041                  
Debt Instrument [Line Items]                  
Debt   $ 850,000,000 $ 850,000,000   $ 850,000,000        
Debt stated rate   6.00% 6.00%   6.00%        
Debt instrument, maturity date   Mar. 01, 2041     Mar. 01, 2041        
5.25% Senior Notes, due November 15, 2043                  
Debt Instrument [Line Items]                  
Debt   $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000        
Debt stated rate   5.25% 5.25%   5.25%        
Debt instrument, maturity date   Nov. 15, 2043     Nov. 15, 2043        
5.05% Senior Notes, due November 15, 2044                  
Debt Instrument [Line Items]                  
Debt   $ 850,000,000 $ 850,000,000   $ 850,000,000        
Debt stated rate   5.05% 5.05%   5.05%        
Debt instrument, maturity date   Nov. 15, 2044     Nov. 15, 2044        
7.25% Senior Debentures, due August 1, 2097                  
Debt Instrument [Line Items]                  
Debt   $ 84,000,000 $ 84,000,000   $ 84,000,000        
Debt stated rate   7.25% 7.25%   7.25%        
Debt instrument, maturity date   Aug. 01, 2097     Aug. 01, 2097        
Line of Credit | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Proceeds from Lines of Credit         $ 1,380,000,000        
Debt Instrument, Term 3 years                
Line of Credit | Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Credit facility fee rate basis points, minimum 0.10%                
Credit facility fee rate basis points, maximum 0.75%                
Line of Credit | Federal Funds Effective Swap Rate [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate 0.50%                
Line of Credit | London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facility [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate 1.00%                
Line of Credit | London Interbank Offered Rate (LIBOR) [Member] | Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Credit facility interest rate, Eurodollar rate plus, minimum 1.00%                
Credit facility interest rate, Eurodollar rate plus, maximum 1.75%                
Other Operating Income (Expense) [Member] | Line of Credit | Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Gain on tendered offers         $ 80,000,000        
Noble Midstream | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity               $ 350,000,000  
Noble Midstream | Line of Credit | Federal Funds Effective Swap Rate [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate         0.50%        
Noble Midstream | Line of Credit | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate         1.00%        
Line of Credit | Leviathan Term Loan                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity             $ 1,000,000,000.0    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   1.00%              
Long-term Line of Credit   $ 625,000,000              
Line of Credit Facility, Maximum Final Balloon Payment Allowable as of Loans Outstanding   35.00%              
Line of Credit | LIBOR Prior to Production Startup [Member] | Leviathan Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate   3.50%              
Line of Credit | LIBOR After Startup Prior to Two Years Before Maturity [Member] | Leviathan Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate   3.25%              
Line of Credit | LIBOR Last Two years Until Maturity [Member] | Leviathan Term Loan                  
Debt Instrument [Line Items]                  
Debt instrument, variable rate   3.75%              
Clayton Williams Energy | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Long-term Line of Credit           $ 1,300,000,000      
[1] .