Related-Party Transactions Alaska Asset Dropdown (Details) bbl in Millions, $ in Millions |
Jul. 20, 2016 |
Jul. 01, 2016
USD ($)
bbl
|
|---|---|---|
| Alaska Logistics Assets [Domain] | ||
| Business Combination, Consideration Transferred | $ 444 | |
| Phase One [Member] | Alaska Logistics Assets [Domain] | ||
| Business Combination, Consideration Transferred | $ 266 | |
| Capacity ratio | bbl | 3.5 | |
| Payments to Acquire Businesses, Gross | $ 239 | |
| Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | 27 | |
| Phase Two [Member] | Alaska Logistics Assets [Domain] | ||
| Business Combination, Consideration Transferred | 178 | |
| Payments to Acquire Businesses, Gross | 160 | |
| Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 18 | |
| Subsequent Event | ||
| Distribution Made to Limited Partner, Declaration Date | Jul. 20, 2016 |