v3.5.0.2

Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Commitments | Future minimum annual payments applicable to all non-cancellable operating leases and purchase obligations as of December 31, 2015, are as follows (in millions):
| Payments Due by Period
| 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | Thereafter |  | Total
Operating leases | $ | 12 |  |  | $ | 10 |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 63 |  |  | $ | 109 |
Purchase obligations | 85 |  |  | 84 |  |  | 84 |  |  | 84 |  |  | 84 |  |  | 61 |  |  | 482 |
Total | $ | 97 |  |  | $ | 94 |  |  | $ | 93 |  |  | $ | 92 |  |  | $ | 91 |  |  | $ | 124 |  |  | $ | 591 |
Environmental Liabilities | Changes in our environmental liabilities for the years ended December 31, 2015 and 2014, were as follows (in millions):
| Tioga Crude Oil Pipeline Release |  | Other Liabilities |  | Total
Balance at December 31, 2014 | $ | 25 |  |  | $ | 7 |  |  | $ | 32 |
Additions | 24 |  |  | 1 |  |  | 25 |
Expenditures | (22 | ) |  | (2 | ) |  | (24 | )
Balance at December 31, 2015 | $ | 27 |  |  | $ | 6 |  |  | $ | 33 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Tabular disclosure of material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 + Details
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