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Income Taxes Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 292 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 127 |  |
Deferred Tax Liabilities, Gross | 5,710 | $ 4,945 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 596 |  |
Net operating losses and alternative minimum tax credit | 472 | 217 |
Valuation allowance | (118) | (121) |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate, Ater Tax | 554 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 1 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Other Information | 0.6 |  |
Proceeds from Income Tax Refunds | $ 530 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts | 530 |  |
State | (34) | $ (54) | $ 78
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 1 |  |
Income Tax Examination, Penalties and Interest Accrued | 6 |  |
Pennsylvania Constitution [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
State | 46 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies | 9 |  |
Net of federal tax [Member] | Pennsylvania Constitution [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
State | 30 |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies | $ 6 |  |
Maximum [Member] | ETP Holdco and other corporate subsidiaries [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2035 |  |
Minimum [Member] | Corporate Subsidiaries [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2017 |  |

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