Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) (Successor, USD $) In Millions	6 Months Ended
Jun. 30, 2011
Change in fuel hedge mark-to-market, net of tax benefit	$ 1
Accumulated Other Comprehensive Income
Change in fuel hedge mark-to-market, net of tax benefit	$ 1

Name:

bni_FuelInterestHedgeMarkToMarketTaxBenefitExpense

Namespace Prefix:

bni

Data Type:

xbrli:monetaryItemType

Balance Type:

na

Period Type:

duration