Employment Benefit Plans Change in Plan Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension and Health and Welfare Benefit Plans, Current Liabilities	$ 30		$ 30
Pension and Health and Welfare Benefit Plans, Liabilities	390		2
Pension and Health and Welfare Benefit Plans, Other Assets	26		390
Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,490		2,014
Actual return on plan assets	(3)		625
Employer contributions	12	[1]	43	[1]
Benefits paid	(141)		(176)
Administrative expenses	(1)		(1)
Settlements	(15)		(15)
Ending balance	2,342		2,490
Funded status (plan assets less projected benefit obligations)	(110)		270
Retiree Health and Welfare Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	0		0
Employer contributions	17	[2]	19	[2]
Plan participants' contributions	6		3
Benefits paid	(23)		(22)
Ending balance	0		0
Funded status (plan assets less projected benefit obligations)	$ (280)		$ (272)

[1] Other than contributions to the BNSF Retirement Plan, employer contributions were classified as Other, Net under Operating Activities in the Company’s Consolidated Statements of Cash Flows.

[2] Employer contributions were classified as Other, Net under Operating Activities in the Company’s Consolidated Statements of Cash Flows.