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Commitments and Contingencies Energy Minimum Required Payments Table (Details) - Energy Segment
$ in Millions
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]  
2017 $ 150
2018 129
2019 126
2020 109
2021 97
Thereafter 640
Minimum required payments for unconditional purchase obligations $ 1,251 [1]
[1] This amount includes $734 million payable ratably over 14 years pursuant to petroleum transportation service agreements between CRRM and each of TransCanada Keystone Limited Partnership and TransCanada Keystone Pipeline, LP (together, "TransCanada"). The purchase obligation reflects the exchange rate between the Canadian dollar and the U.S. dollar as of December 31, 2016, where applicable. Under the agreements, CRRM receives transportation of at least 25,000 barrels per day of crude oil with a delivery point at Cushing, Oklahoma for a term of 20 years on TransCanada's Keystone pipeline system. CRRM began receiving crude oil under the agreements in the first quarter of 2011.