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Supplemental Financial Statement Information Table - Balance Sheets (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Cash and cash equivalents | $ 445 |  | $ 419 | $ 519 | $ 336
Accounts receivable from related companies | 111 |  | 111 |  |
Other current assets | 308 |  | 350 |  |
Total current assets | 7,198 |  | 6,750 |  |
Property, plant and equipment, net | 68,187 | $ 66,962 | 66,963 |  |
Advances to and investments in unconsolidated affiliates | 2,838 |  | 2,642 |  |
Total assets | 90,812 |  | 88,246 |  |
Accounts payable | 3,645 |  | 3,493 |  |
Accounts payable to related companies | 14 |  | 59 |  |
Accrued and other current liabilities | 2,686 | 2,917 | 2,918 |  |
Total current liabilities | 6,429 |  | 9,310 |  |
Long-term debt, less current maturities | 46,499 | 43,379 | 43,373 |  |
Other non-current liabilities | 1,139 | $ 1,172 | 1,184 |  |
Commitments and contingencies |  |  |  |  |
Common Unitholders | 20,872 |  | 20,606 |  |
General Partner | (5) |  | (5) |  |
Accumulated other comprehensive loss | (33) |  | (42) |  |
Total partners’ capital | 20,834 |  | 20,559 |  |
Total liabilities and equity | 90,812 |  | 88,246 |  |
Parent Company [Member] |  |  |  |  |
Cash and cash equivalents | 1 |  | 2 | $ 1 | $ 1
Accounts receivable from related companies | 0 |  | 65 |  |
Other current assets | 0 |  | 1 |  |
Total current assets | 1 |  | 68 |  |
Property, plant and equipment, net | 23 |  | 23 |  |
Advances to and investments in unconsolidated affiliates | 25,411 |  | 26,581 |  |
Total assets | 25,435 |  | 26,672 |  |
Accounts payable | 0 |  | 2 |  |
Accounts payable to related companies | 58 |  | 65 |  |
Interest payable | 1 |  | 76 |  |
Accrued and other current liabilities | 1 |  | 3 |  |
Total current liabilities | 60 |  | 146 |  |
Long-term debt, less current maturities | 124 |  | 5,519 |  |
Long-term notes payable – related companies | 4,416 |  | 445 |  |
Other non-current liabilities | 1 |  | 3 |  |
Common Unitholders | 20,872 |  | 20,606 |  |
General Partner | (5) |  | (5) |  |
Accumulated other comprehensive loss | (33) |  | (42) |  |
Total partners’ capital | 20,834 |  | 20,559 |  |
Total liabilities and equity | $ 25,435 |  | $ 26,672 |  |

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