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Supplemental Financial Statement Information Table - Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Cash and cash equivalents | $ 529 |  | $ 419 | $ 547 | $ 336
Accounts receivable from related companies | 119 |  | 111 |  |
Other current assets | 299 |  | 350 |  |
Total current assets | 7,127 |  | 6,750 |  |
Property, plant and equipment, net | 67,317 | $ 66,962 | 66,963 |  |
Advances to and investments in unconsolidated affiliates | 2,653 |  | 2,642 |  |
Total assets | 89,773 |  | 88,246 |  |
Accounts payable | 3,965 |  | 3,493 |  |
Accounts payable to related companies | 53 |  | 59 |  |
Accrued and other current liabilities | 2,367 | 2,917 | 2,918 |  |
Total current liabilities | 6,695 |  | 9,310 |  |
Long-term debt, less current maturities | 46,373 | 43,379 | 43,373 |  |
Other non-current liabilities | 1,154 | $ 1,172 | 1,184 |  |
Commitments and contingencies |  |  |  |  |
Common Unitholders | 20,693 |  | 20,606 |  |
General Partner | (5) |  | (5) |  |
Accumulated other comprehensive loss | (34) |  | (42) |  |
Total partners’ capital | 20,654 |  | 20,559 |  |
Total liabilities and equity | 89,773 |  | 88,246 |  |
Parent Company [Member] |  |  |  |  |
Cash and cash equivalents | 13 |  | 2 | $ 1 | $ 1
Accounts receivable from related companies | 0 |  | 65 |  |
Other current assets | 1 |  | 1 |  |
Total current assets | 14 |  | 68 |  |
Property, plant and equipment, net | 23 |  | 23 |  |
Advances to and investments in unconsolidated affiliates | 26,124 |  | 26,581 |  |
Total assets | 26,161 |  | 26,672 |  |
Accounts payable | 0 |  | 2 |  |
Accounts payable to related companies | 55 |  | 65 |  |
Interest payable | 88 |  | 76 |  |
Accrued and other current liabilities | 1 |  | 3 |  |
Total current liabilities | 144 |  | 146 |  |
Long-term debt, less current maturities | 132 |  | 5,519 |  |
Long-term notes payable – related companies | 5,229 |  | 445 |  |
Other non-current liabilities | 2 |  | 3 |  |
Common Unitholders | 20,693 |  | 20,606 |  |
General Partner | (5) |  | (5) |  |
Accumulated other comprehensive loss | (34) |  | (42) |  |
Total partners’ capital | 20,654 |  | 20,559 |  |
Total liabilities and equity | $ 26,161 |  | $ 26,672 |  |

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