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Supplemental Financial Statement Information Table - Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | --- | ---
Liabilities associated with assets held for sale | $ 0 |  | $ 75 |  |  |  |
Cash and cash equivalents | 547 |  | 336 | $ 353 | $ 467 |  |
Accounts receivable, net | 3,590 |  | 4,504 |  |  |  |
Accounts receivable from related companies | 93 |  | 53 |  |  |  |
Other current assets | 304 | $ 303 | 295 |  |  |  |
Total current assets | 6,593 |  | 10,683 |  |  |  |
Property, plant and equipment, net | 61,975 | 61,088 | 61,088 |  |  |  |
Advances to and investments in unconsolidated affiliates | 2,701 |  | 2,705 |  |  |  |
Intangible assets, net | 5,936 | 6,016 | 6,116 |  |  |  |
Goodwill | 4,768 |  | 4,768 |  |  |  |
Other non-current assets, net | 936 | 925 | 886 |  |  |  |
Total assets | 82,909 |  | 86,246 |  |  |  |
Accounts payable | 3,704 |  | 4,685 |  |  |  |
Accounts payable to related companies | 53 |  | 31 |  |  |  |
Accrued and other current liabilities | 2,944 |  | 2,582 |  |  |  |
Total current liabilities | 7,261 |  | 7,897 |  |  |  |
Long-term debt, less current maturities | 41,779 |  | 43,671 |  |  |  |
Other non-current liabilities | 1,244 | $ 1,218 | 1,217 |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
General Partner | (3) |  | (3) |  |  |  |
Common Unitholders | (1,696) |  | (1,643) |  |  |  |
Series A Convertible Preferred Units | 519 |  | 450 |  |  |  |
Total partners’ capital | (1,180) |  | (1,196) |  |  |  |
Total liabilities and equity | 82,909 |  | 86,246 |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |
Cash and cash equivalents | 1 |  | 1 |  |  | $ 3 | $ 2
Accounts receivable from related companies | 103 |  | 65 |  |  |  |
Other current assets | 1 |  | 1 |  |  |  |
Total current assets | 105 |  | 67 |  |  |  |
Property, plant and equipment, net | 27 |  | 27 |  |  |  |
Advances to and investments in unconsolidated affiliates | 5,805 |  | 6,082 |  |  |  |
Goodwill | 9 |  | 9 |  |  |  |
Other non-current assets, net | 8 |  | 8 |  |  |  |
Total assets | 5,954 |  | 6,193 |  |  |  |
Accounts payable to related companies | 1 |  | 0 |  |  |  |
Interest payable | 78 |  | 66 |  |  |  |
Accrued and other current liabilities | 8 |  | 4 |  |  |  |
Total current liabilities | 87 |  | 70 |  |  |  |
Long-term debt, less current maturities | 6,386 |  | 6,700 |  |  |  |
Long-term notes payable – related companies | 658 |  | 617 |  |  |  |
Other non-current liabilities | 3 |  | 2 |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |
General Partner | (3) |  | (3) |  |  |  |
Common Unitholders | (1,696) |  | (1,643) |  |  |  |
Series A Convertible Preferred Units | 519 |  | 450 |  |  |  |
Total partners’ capital | (1,180) |  | (1,196) |  |  |  |
Total liabilities and equity | $ 5,954 |  | $ 6,193 |  |  |  |

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