Commitments and Contingencies, Environmental Liabilities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Dec. 31, 2013
Environmental Liabilities
Environmental liability accrual	$ 267	$ 262
Martinez Refinery and Los Angeles Acquisition
Environmental Liabilities
Environmental liability accrual	221	216
Remediation activities measurement period	We cannot reasonably determine the full extent of remedial activities that may be required at the Martinez refinery and for assets acquired in the Los Angeles Acquisition, and it is possible that we will identify additional investigation and remediation costs for site cleanup activities as more information becomes available.
Martinez refinery
Environmental Liabilities
Environmental insurance coverage ceiling	190
Self-insurance deductible	50
Number of previous owners (owners)	2
Tesoro Logistics LP
Environmental Liabilities
Environmental liability accrual	$ 23	$ 24

$ 267

$ 262

Remediation activities measurement period

We cannot reasonably determine the full extent of remedial activities that may be required at the Martinez refinery and for assets acquired in the Los Angeles Acquisition, and it is possible that we will identify additional investigation and remediation costs for site cleanup activities as more information becomes available.

Environmental Liabilities

Self-insurance deductible

50

Environmental liability accrual

$ 23

$ 24