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Consolidated Statements of Changes in Equity (USD $)
In Millions, unless otherwise specified
Total
Members Equity
Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2011 $ 34,749us-gaap_StockholdersEquity $ 34,952us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
$ (203)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Member's Equity [Roll Forward]      
Total Comprehensive income, net of tax 3,330us-gaap_ComprehensiveIncomeNetOfTax 3,372us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
(42)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Cash distributions to Parent (3,750)bni_CashDistributionsDividendsPaid (3,750)bni_CashDistributionsDividendsPaid
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
0bni_CashDistributionsDividendsPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2012 34,329us-gaap_StockholdersEquity 34,574us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
(245)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Member's Equity [Roll Forward]      
Total Comprehensive income, net of tax 4,283us-gaap_ComprehensiveIncomeNetOfTax 3,793us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
490us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Cash distributions to Parent (4,000)bni_CashDistributionsDividendsPaid (4,000)bni_CashDistributionsDividendsPaid
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
0bni_CashDistributionsDividendsPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2013 34,612us-gaap_StockholdersEquity 34,367us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
245us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Member's Equity [Roll Forward]      
Total Comprehensive income, net of tax 3,622us-gaap_ComprehensiveIncomeNetOfTax 3,869us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
(247)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Cash distributions to Parent (3,500)bni_CashDistributionsDividendsPaid (3,500)bni_CashDistributionsDividendsPaid
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
0bni_CashDistributionsDividendsPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2014 $ 34,734us-gaap_StockholdersEquity $ 34,736us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= bni_MembersEquityMember
$ (2)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember