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Debt Guarantees (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Kinder Morgan Energy Partners, L.P. | Payment Guarantee  
Guarantor Obligations [Line Items]  
BNSF Ownership Percentage 0.50%us-gaap_MinorityInterestOwnershipPercentageByParent
/ bni_GuaranteeEntityNameAxis
= bni_KinderMorganEnergyPartnersLPMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
Principal Amount Guaranteed $ 190bni_PrincipalAmountGuaranteed
/ bni_GuaranteeEntityNameAxis
= bni_KinderMorganEnergyPartnersLPMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
Maximum Future Payments 190us-gaap_GuaranteeObligationsMaximumExposure
/ bni_GuaranteeEntityNameAxis
= bni_KinderMorganEnergyPartnersLPMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
Maximum Recourse Amount 0bni_MaximumRecourseAmount
/ bni_GuaranteeEntityNameAxis
= bni_KinderMorganEnergyPartnersLPMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember		 [1]
Capitalized Obligations 2us-gaap_GuaranteeObligationsCurrentCarryingValue
/ bni_GuaranteeEntityNameAxis
= bni_KinderMorganEnergyPartnersLPMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember		 [2]
Chevron Phillips Chemical Company, LP | Indemnification Agreement  
Guarantor Obligations [Line Items]  
BNSF Ownership Percentage 0.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ bni_GuaranteeEntityNameAxis
= bni_ChevronPhillipsChemicalCompanyLpMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
Remaining Term (in years) 2 years
Capitalized Obligations $ 4us-gaap_GuaranteeObligationsCurrentCarryingValue
/ bni_GuaranteeEntityNameAxis
= bni_ChevronPhillipsChemicalCompanyLpMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember		 [3]
[1] Reflects the maximum amount the Company could recover from a third party other than the counterparty.
[2] Reflects capitalized obligations that are recorded on the Company’s Consolidated Balance Sheet.
[3] Reflects the asset and corresponding liability for the fair value of these guarantees required by authoritative accounting guidance related to guarantees.