Organization and Basis of Presentation, Acquisition and Merger Agreement (Details) - Alaska Logistics Assets [Domain] $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2016
USD ($)
| |
| Acquisition | |
| Business Combination, Consideration Transferred | $ 444 |
| Phase One [Member] | |
| Acquisition | |
| Business Combination, Consideration Transferred | 266 |
| Payments to Acquire Businesses, Gross | 240 |
| Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | 26 |
| Phase Two [Member] | |
| Acquisition | |
| Business Combination, Consideration Transferred | 178 |
| Payments to Acquire Businesses, Gross | 160 |
| Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 18 |