XML 68 R38.htm IDEA: XBRL DOCUMENT v2.4.1.9
Debt (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Oct. 03, 2013
Debt Instrument [Line Items]        
Debt $ 6,203,000,000us-gaap_DebtInstrumentCarryingAmount   $ 6,197,000,000us-gaap_DebtInstrumentCarryingAmount  
Unamortized Discount (25,000,000)us-gaap_DebtInstrumentUnamortizedDiscount   (26,000,000)us-gaap_DebtInstrumentUnamortizedDiscount  
Total Debt, Net of Discount 6,178,000,000us-gaap_LongTermDebt   6,171,000,000us-gaap_LongTermDebt  
Capital Lease Obligations, Current (65,000,000)us-gaap_CapitalLeaseObligationsCurrent (68,000,000)us-gaap_CapitalLeaseObligationsCurrent    
Long-term Debt Due After One Year 6,113,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 6,103,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 6,103,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations  
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 (percentage in hundredths) 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
  0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
 
Debt instrument, maturity date Oct. 03, 2018 Oct. 03, 2018    
Revolving Credit Facility Maximum Borrowing Capacity 4,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ 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 aggregate short-term loans and letters of credit, maximum 500,000,000nbl_CreditFacilityAggregateShortTermLoansAndLettersOfCreditMaximum
/ us-gaap_DebtInstrumentAxis
= us-gaap_LineOfCreditMember
     
Credit facility interest rate, Eurodollar rate plus, minimum       1.00%nbl_CreditFacilityInterestRateEurodollarRatePlusMinimum
/ 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 419,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
  413,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
 
Interest Rate (percentage in hundredths) 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 (65,000,000)us-gaap_CapitalLeaseObligationsCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
  (68,000,000)us-gaap_CapitalLeaseObligationsCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_CapitalLeaseObligationsMember
 
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 (percentage in hundredths) 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
 
Interest Rate (percentage in hundredths) 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
  4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueDecember152021Member
 
Debt instrument, maturity date Dec. 15, 2021 Dec. 15, 2021    
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 (percentage in hundredths) 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    
3.90% Senior Notes, due November 15, 2024        
Debt Instrument [Line Items]        
Debt 650,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
  650,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
 
Interest Rate (percentage in hundredths) 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
  3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152024Member
 
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 (percentage in hundredths) 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 (percentage in hundredths) 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 (percentage in hundredths) 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152043Member
  5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesDueNovember152043Member
 
5.05% Senior Notes, due November 15, 2044        
Debt Instrument [Line Items]        
Debt 850,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
  850,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
 
Interest Rate (percentage in hundredths) 5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
  5.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nbl_SeniorNotesdueNovember152044Member
 
Debt instrument, maturity date   Nov. 15, 2044    
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 (percentage in hundredths) 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