1.0.0.3 false Report of Independent Registered Public Accounting Firm (Unaudited) false 1 $ false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 2 Report of Independent Registered Public Accounting Firm [Abstract] 0 bni_ReportOfIndependentRegisteredPublicAccountingFirmAbstract bni false na duration string Report of Independent Registered Public Accounting Firm. false false false false false true false false false 1 false false 0 0 false false Report of Independent Registered Public Accounting Firm. false 3 Report of Independent Registered Public Accounting Firm 1 bni_ReportOfIndependentRegisteredPublicAccountingFirmTextBlock bni false na duration string Disclosure describing the report of the Independent Registered Public Accounting Firm within the Form 10-Q. false false false false false false false false false 1 false false 0 0  <html> <head></head> <body>  <div style="font-family: 'Times New Roman',Times,serif"> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>11. Report of Independent Registered Public Accounting Firm</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     PricewaterhouseCoopers LLP’s review report is included in this quarterly report; however, PricewaterhouseCoopers LLP does not express an opinion on the unaudited financial information. Accordingly, such report is not a “report” or “part of a registration statement” within the meaning of Sections 7 and 11 of the Securities Act of 1933 and PricewaterhouseCoopers LLP is not subject to the liability provisions of Section 11 of such Act with respect to the review report. </div>   </div> </body> </html>  11. Report of Independent Registered Public false false Disclosure describing the report of the Independent Registered Public Accounting Firm within the Form 10-Q. No authoritative reference available. false false 1 2 false UnKnown UnKnown UnKnown false true