Employment Benefit Plans Expected Benefit Payments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Expected benefit payments, 2014	$ 166	[1]
Expected benefit payments, 2015	156	[1]
Expected benefit payments, 2016	156	[1]
Expected benefit payments, 2017	156	[1]
Expected benefit payments, 2018	153	[1]
Expected benefit payments, 2019 - 2023	719	[1]
Retiree Health and Welfare Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected benefit payments, 2014	22
Expected benefit payments, 2015	22
Expected benefit payments, 2016	21
Expected benefit payments, 2017	21
Expected benefit payments, 2018	20
Expected benefit payments, 2019 - 2023	$ 92

[1] Primarily consists of the BNSF Retirement Plan payments, which are made from the plan trust and do not represent an immediate cash outflow to the Company.