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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tangible Asset Impairment Charges | $ 133 | $ 110 |
ARO Underlying Asset | 14 | 18 |
Impairment of Intangible Assets, Finite-lived |  | 24 |
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 13 | 6 |
Deferred Tax Liabilities, Gross | 5,710 | 4,945 |
Long-term Debt, Fair Value | 45,050 | 33,220 |
Impairment losses | 826 | 205 |
Goodwill acquired | 509 | 23 |
Goodwill | 5,170 | 5,485 | $ 5,871
Long-term Debt | 43,802 | 36,968 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 |  |
Midstream [Member] |  |  |
Tangible Asset Impairment Charges | 10 |  |
Impairment losses | (32) |  |
Investment In ETP [Member] |  |  |
Impairment losses | 670 | 205 |
Goodwill acquired | 428 | 0 |
Goodwill | 3,897 | 5,428 | 7,642
NGL and refined products transportation and services [Member] |  |  |
Impairment losses |  | (106) |
Interstate Transportation and Storage [Member] |  |  |
Impairment losses | (638) | (99) |
Retail Marketing [Member] |  |  |
Excise Taxes Collected | $ 3,480 | $ 3,050 | $ 2,460

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