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Employment Benefit Plans Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2019 $ 183 [1]
Expected benefit payments, 2020 150 [1]
Expected benefit payments, 2021 144 [1]
Expected benefit payments, 2022 139 [1]
Expected benefit payments, 2023 134 [1]
Expected benefit payments, 2024 - 2028 633 [1]
Retiree Health and Welfare Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected benefit payments, 2019 18 [2]
Expected benefit payments, 2020 17 [2]
Expected benefit payments, 2021 17 [2]
Expected benefit payments, 2022 16 [2]
Expected benefit payments, 2023 15 [2]
Expected benefit payments, 2024 - 2028 67 [2]
Expected contributions to unfunded non-qualified pension plan in next fiscal year 0
Funded Pension Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to unfunded non-qualified pension plan in next fiscal year 0
Unfunded Non-Qualified Pension Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions to unfunded non-qualified pension plan in next fiscal year $ 31
[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.
[2] Expected payments for a portion of 2019 will be made from the plan trust and do not represent an immediate cash outflow to the Company.