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Summary of Significant Accounting Policies Cumulative Effect of Changes due to Adoption of ASU 2014-09 (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Other current assets | $ 71 | $ 89 | $ 81
Property and equipment, net | 1,522 | 1,557 | 1,557
Intangible assets, net | (656) | (668) | (768)
Other noncurrent assets | 91 | 84 | 45
Other noncurrent liabilities | 137 | 126 | 125
Common Units |  |  |
Total partners' capital | $ 932 | 1,893 | $ 1,947
Accounting Standards Update 2014-09 [Member] |  |  |
Other current assets |  | 8 |
Property and equipment, net |  | 0 |
Intangible assets, net |  | (100) |
Other noncurrent assets |  | 39 |
Other noncurrent liabilities |  | 1 |
Total partners' capital |  | $ (54) |

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