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Long-Term Debt (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 03, 2013
Nov. 08, 2013
Nov. 07, 2014
Debt Instrument [Line Items]            
Debt $ 6,197,000,000us-gaap_DebtInstrumentCarryingAmount $ 4,843,000,000us-gaap_DebtInstrumentCarryingAmount        
Unamortized Discount (26,000,000)us-gaap_DebtInstrumentUnamortizedDiscount (19,000,000)us-gaap_DebtInstrumentUnamortizedDiscount        
Total Debt, Net of Discount 6,171,000,000us-gaap_LongTermDebt 4,824,000,000us-gaap_LongTermDebt        
Current Portion of Long Term Debt, Net of Discount 0us-gaap_UnsecuredDebtCurrent 200,000,000us-gaap_UnsecuredDebtCurrent        
Capital Lease Obligations, Current (68,000,000)us-gaap_CapitalLeaseObligationsCurrent (58,000,000)us-gaap_CapitalLeaseObligationsCurrent        
Long-Term Debt Due After One Year 6,103,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 4,566,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations        
Unamortized Debt Issuance Costs 50,000,000us-gaap_DebtIssuanceCosts          
Repayments of Long-term Lines of Credit 1,050,000,000us-gaap_RepaymentsOfLongTermLinesOfCredit 900,000,000us-gaap_RepaymentsOfLongTermLinesOfCredit 150,000,000us-gaap_RepaymentsOfLongTermLinesOfCredit      
Repayments of Long-term Debt [Abstract]            
2014 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths          
2015 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo          
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree          
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour          
2018 1,000,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive          
Thereafter 4,784,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive          
Total 5,784,000,000nbl_TotalOfMaturities          
Credit Facility, due October 3, 2018            
Debt Instrument [Line Items]            
Debt 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
       
Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
       
Debt Instrument, Offering Date       Oct. 03, 2013    
Line of Credit Facility, Maximum Borrowing Capacity       4,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Credit facility aggregate short-term loans and letters of credit, maximum       500,000,000nbl_CreditFacilityAggregateShortTermLoansAndLettersOfCreditMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Credit facility covenant term debt to capitalization ratio maximum       65.00%nbl_CreditFacilityCovenantTermDebtToCapitalizationRatioMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Debt Instrument, Maturity Date Oct. 03, 2018 Oct. 03, 2018        
Credit facility interest rate, Eurodollar rate plus, minimum       1.00%nbl_CreditFacilityInterestRateEurodollarRatePlusMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Credit facility fee rate basis points, minimum       0.125%nbl_CreditFacilityFeeRateBasisPointsMinimum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Credit facility fee rate basis points, maximum       0.30%nbl_CreditFacilityFeeRateBasisPointsMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Credit facility interest rate, Eurodollar rate plus, maximum       1.45%nbl_CreditFacilityInterestRateEurodollarRatePlusMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
   
Capital Lease and Other Obligations            
Debt Instrument [Line Items]            
Debt 413,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
359,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
       
Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
       
Capital Lease Obligations, Current (68,000,000)us-gaap_CapitalLeaseObligationsCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
(58,000,000)us-gaap_CapitalLeaseObligationsCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
       
Senior Notes, due April 15, 2014 [Member]            
Debt Instrument [Line Items]            
Debt 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril152014Member
[1] 200,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril152014Member
[1]        
Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril152014Member
[1] 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril152014Member
[1]        
Debt Instrument, Maturity Date   Apr. 15, 2014        
8.25% Senior Notes, due March 1, 2019            
Debt Instrument [Line Items]            
Debt 1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12019Member
1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12019Member
       
Interest Rate 8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12019Member
8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12019Member
       
Debt Instrument, Maturity Date Mar. 01, 2019 Mar. 01, 2019        
4.15% Senior Notes, due December 15, 2021            
Debt Instrument [Line Items]            
Debt 1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
    1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
 
Interest Rate 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
    5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
 
Unamortized Debt Issuance Costs         6,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
 
Debt Instrument, Offering Date         Nov. 08, 2013  
Debt Instrument, Maturity Date Dec. 15, 2021 Dec. 15, 2021        
Debt offerings proceeds, net of discount and underwriting fees         985,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
 
7.25% Senior Notes, due October 15, 2023            
Debt Instrument [Line Items]            
Debt 100,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
100,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
       
Interest Rate 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
       
Debt Instrument, Maturity Date Oct. 15, 2023 Oct. 15, 2023        
Senior Notes Due November 15, 2024 [Member]            
Debt Instrument [Line Items]            
Debt 650,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
      650,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
Interest Rate 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
    3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
 
Debt Instrument, Offering Date           Nov. 07, 2014
Debt Instrument, Maturity Date Nov. 15, 2024          
8.00% Senior Notes, due April 1, 2027            
Debt Instrument [Line Items]            
Debt 250,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril12027Member
250,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril12027Member
       
Interest Rate 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril12027Member
8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueApril12027Member
       
Debt Instrument, Maturity Date Apr. 01, 2027 Apr. 01, 2027        
6.00% Senior Notes, due March 1, 2041            
Debt Instrument [Line Items]            
Debt 850,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12041Member
850,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12041Member
       
Interest Rate 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12041Member
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueMarch12041Member
       
Debt Instrument, Maturity Date Mar. 01, 2041 Mar. 01, 2041        
5.25% Senior Notes, due November 15, 2043            
Debt Instrument [Line Items]            
Debt 1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152043Member
1,000,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152043Member
       
Interest Rate 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152043Member
5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152043Member
       
Debt Instrument, Maturity Date Nov. 15, 2043          
Senior Notes, due November 15, 2044 [Member]            
Debt Instrument [Line Items]            
Debt 850,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
      850,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
Interest Rate 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
    5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
 
Unamortized Debt Issuance Costs         15,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
 
Debt Instrument, Maturity Date Nov. 15, 2044          
Debt offerings proceeds, net of discount and underwriting fees         1,500,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
 
7.25% Senior Debentures, due August 1, 2097            
Debt Instrument [Line Items]            
Debt $ 84,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueAugust12097Member
$ 84,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueAugust12097Member
       
Interest Rate 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueAugust12097Member
7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueAugust12097Member
       
Debt Instrument, Maturity Date Aug. 01, 2097 Aug. 01, 2097        
[1] We repaid the senior notes on their due date