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Income Taxes Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Nov. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  |  | $ 1,800 |  |
Operating Loss Carryforwards, Expiration Date |  |  | Jan. 01, 2031 |  |
Deferred Tax Liabilities, Gross | $ 4,035 |  | $ 3,826 | $ 4,035 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  | 620 |  |
Net operating losses, alternative minimum tax credit and other carryforwards | 683 |  | 768 | 683 |
Operating Loss Carryforwards | 364 |  |  | 364 |
Valuation allowance | $ (189) |  | (96) | (189) |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate, Ater Tax |  |  | 588 |  |
Proceeds from Income Tax Refunds |  |  | 530 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts |  |  | 530 |  |
State |  |  | 19 | (16) | $ (34)
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  |  | 6 |  |
Income Tax Examination, Penalties and Interest Accrued |  |  | 15 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |  |  |
Tax Credit Carryforward, Valuation Allowance |  |  | 98 |  |
Deferred Income Tax Expense (Benefit) |  |  | (7) | $ (1,871) | $ (177)
ETP Holdco and other corporate subsidiaries [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  | 2,600 |  |
Corporate Subsidiaries [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating losses, alternative minimum tax credit and other carryforwards |  |  | 31 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  |  | 168 |  |
Net of federal tax [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
State |  |  | $ 53 |  |
Maximum [Member] | ETP Holdco and other corporate subsidiaries [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  |  | Dec. 31, 2037 |  |
Maximum [Member] | Corporate Subsidiaries [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  |  | Dec. 31, 2037 |  |
Minimum [Member] | Corporate Subsidiaries [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  |  | Jan. 01, 2019 |  |
Reclassed to current income tax receivable within 12 months [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating losses, alternative minimum tax credit and other carryforwards |  |  | $ 16 |  |
Pennsylvania Constitution [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
State |  |  | 67 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies |  |  | 34 |  |
Pennsylvania Constitution [Member] | Net of federal tax [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies |  |  | $ 27 |  |

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