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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASU No. 2014-09 was as follows:
| Balance at December 31, 2017 |  | Adjustments Due to ASC 606 |  | Balance at January 1, 2018
| (in millions)
Assets |  |  |  |  |
Other current assets | $ | 81 |  |  | $ | 8 |  |  | $ | 89 |
Property and Equipment, net | 1,557 |  |  | — |  |  | 1,557 |
Intangible assets, net | 768 |  |  | (100 | ) |  | 668 |
Other noncurrent assets | 45 |  |  | 39 |  |  | 84 |
Liabilities and Equity |  |  |  |  |
Other noncurrent liabilities | 125 |  |  | 1 |  |  | 126 |
Common unitholders | 1,947 |  |  | (54 | ) |  | 1,893 |
The adoption of the new revenue standard resulted in reclassifications to/from revenue, cost of sales, and operating expenses. Additionally, changes in timing of revenue recognition have required the creation of contract asset or contract liability balances, as well as certain balance sheet reclassifications. In accordance with the requirements of Topic 606, the disclosure below shows the impact of adopting the new standard on the income statement and the balance sheet.
| For the Three Months Ended March 31, 2018
| As Reported |  | Balances Without Adoption of ASC 606 |  | Effect of Change Higher/(Lower)
| (in millions)
Revenues |  |  |  |  |
Wholesale motor fuel sales to third parties | $ | 3,094 |  |  | $ | 3,104 |  |  | $ | (10 | )
Other | 41 |  |  | 41 |  |  | — |
Costs of Sales |  |  |  |  |  |
Other | 14 |  |  | 15 |  |  | (1 | )
Operating Expenses |  |  |  |  |
Other Operating | 98 |  |  | 100 |  |  | (2 | )
Depreciation, amortization and accretion | 49 |  |  | 55 |  |  | (6 | )
| March 31, 2018
| As Reported |  | Balances Without Adoption of ASC 606 |  | Effect of Change Higher/(Lower)
| (in millions)
Assets |  |  |  |  |
Other current assets | $ | 71 |  |  | $ | 62 |  |  | $ | 9 |
Property and Equipment, net | 1,522 |  |  | 1,522 |  |  | — |
Intangible assets, net | 656 |  |  | 761 |  |  | (105 | )
Other noncurrent assets | 91 |  |  | 49 |  |  | 42 |
Liabilities and Equity |  |  |  |  |
Other noncurrent liabilities | 137 |  |  | 136 |  |  | 1 |
Common unitholders | 932 |  |  | 987 |  |  | (55 | )

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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