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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impairment losses |  |  |  |  |  | $ 2,880 | $ 74 | $ 431
Operating Lease, Liability | $ 890 |  |  |  |  | 890 |  |
Operating Lease, Right-of-Use Asset | 1,000 |  |  | $ 964 |  | 1,000 | 964 |
Asset Retirement Obligation | 270 |  |  | 247 |  | 270 | 247 |
Costs Incurred, Asset Retirement Obligation Incurred |  |  |  |  |  | 16 | 5 | 13
Tangible Asset Impairment Charges |  |  |  |  |  |  |  | 9
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 34 |  |  | 31 |  | 34 | 31 |
Long-term Debt, Fair Value | 56,210 |  |  | 54,790 |  | 56,210 | 54,790 |
Impairment losses |  |  |  | (9) | $ (12) | (2,815) | (21) |
Goodwill acquired |  |  |  |  |  | 9 | 307 |
Goodwill | 2,391 |  |  | 5,167 |  | 2,391 | 5,167 | 4,885
Long-term Debt | 51,438 |  |  | 51,054 |  | 51,438 | 51,054 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  |  |  |  |  | 0 |  |
Inventory Write-down |  |  |  |  |  | 82 |  |
Inventory Valuation Reserves |  |  |  | 311 |  |  | 311 | 229
Midstream [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  | $ (483) | (378) |  | (483) | (9) |
Goodwill acquired |  |  |  |  |  | 0 | 0 |
Goodwill | 0 |  |  | 483 |  | 0 | 483 | 492
Other Segments [Member] |  |  |  |  |  |  |  |
Impairment losses | (15) | $ (132) | (40) |  |  | (198) | 0 |
Goodwill acquired |  |  |  |  |  | 0 | 35 |
Goodwill | 82 |  |  | 184 |  | 82 | 184 | 149
Investment In Sunoco LP [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | 0 | 0 |
Goodwill acquired |  |  |  |  |  | 9 | 0 |
Goodwill | 1,564 |  |  | 1,555 |  | 1,564 | 1,555 | 1,559
Retail Marketing [Member] |  |  |  |  |  |  |  |
Excise Taxes Collected |  |  |  |  |  | 301 | 386 | 370
Interstate Transportation and Storage [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | 58 |  |
Impairment losses |  | (43) | (183) |  |  | (226) | (12) |
Goodwill acquired |  |  |  |  |  | 0 | 42 |
Goodwill | 0 |  |  | 226 |  | 0 | 226 | 196
Investment In USAC [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  | $ (619) |  |  | (619) | 0 |
Goodwill acquired |  |  |  |  |  | 0 | 0 |
Goodwill | 0 |  |  | 619 |  | 0 | 619 | 619
Crude oil transportation and services [Member] |  |  |  |  |  |  |  |
Impairment losses |  | $ (1,280) |  |  |  | (1,279) | 0 |
Goodwill acquired |  |  |  |  |  | 0 | 230 |
Goodwill | 52 |  |  | 1,397 |  | 52 | 1,397 | 1,167
Intrastate Transportation And Storage [Member] |  |  |  |  |  |  |  |
Impairment losses | (10) |  |  |  |  | (10) | 0 |
Goodwill acquired |  |  |  |  |  | 0 | 0 |
Goodwill | 0 |  |  | 10 |  | 0 | 10 | $ 10
Sunoco LP [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  | 47 |
Long-term Debt | 3,112 |  |  | 3,071 |  | 3,112 | 3,071 |
USAC [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | 8 | $ 6 |
PEI [Member] | Other Segments [Member] |  |  |  |  |  |  |  |
Impairment losses | (11) |  |  |  |  |  |  |
SemGroup [Member] |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | (244) |  |
Goodwill acquired |  |  |  | 265 |  |  |  |
Fair value exceeding carrying value by less than 20% [Member] |  |  |  |  |  |  |  |
Goodwill | $ 368 |  |  |  |  | $ 368 |  |
Customer relationships, contracts and agreements (3 to 46 years) |  |  |  |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | $ 30 |  |  |  |

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