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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Cash distributions	$ 3,500bni_CashDistributionsDividendsPaid	$ 4,000bni_CashDistributionsDividendsPaid	$ 3,750bni_CashDistributionsDividendsPaid
Revenues from related parties	148us-gaap_RevenueFromRelatedParties	150us-gaap_RevenueFromRelatedParties	50us-gaap_RevenueFromRelatedParties
Related Party Transaction Expenditures with Affiliates	20	20	23
Parent Company
Related Party Transaction [Line Items]
Cash distributions	3,500	4,000	3,750
Tax refund from parent company	104	8	0
Tax payments to parent company	$ 1,253	$ 1,560	$ 1,033

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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