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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 02, 2021 | Dec. 05, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Impairment losses |  |  |  |  |  |  |  |  | $ 21 | $ 2,880 | $ 74
Asset Retirement Obligation |  |  | $ 369 | $ 280 |  |  |  |  | 369 | 280 |
Costs Incurred, Asset Retirement Obligation Incurred |  |  |  |  |  |  |  |  | 12 | 16 | 5
Asset Retirement Obligation, Legally Restricted Assets, Fair Value |  |  | 39 | 34 |  |  |  |  | 39 | 34 |
Long-term Debt, Fair Value |  |  | 54,970 | 56,210 |  |  |  |  | 54,970 | 56,210 |
Impairment losses |  |  |  |  |  |  | $ (9) | $ (12) |  | (2,815) |
Goodwill |  |  |  |  |  |  |  |  | 142 | 9 |
Goodwill |  |  | 2,533 | 2,391 |  |  | 5,167 |  | 2,533 | 2,391 | 5,167
Long-term Debt |  |  | 49,702 | 51,438 |  |  |  |  | 49,702 | 51,438 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  |  |  |  |  |  |  |  | 0 |  |
Inventory Write-down |  |  |  |  |  |  |  |  | 190 | 82 | 79
Inventory Valuation Reserves |  |  |  | 121 |  |  | 311 |  |  | 121 | 311
Impairment of investment in unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 129 | 0
Revenue from Related Parties |  |  |  |  |  |  |  |  | 410 | 466 | 492
White Cliffs |  |  |  |  |  |  |  |  |  |  |
Impairment of investment in unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 129 |
Midstream |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ (483) |  |  |  | (483) |
Goodwill |  |  |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 483 |  | 0 | 0 | 483
All Other |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | (15) | $ (132) | (40) |  |  |  | (198) |
Goodwill |  |  |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 82 | 82 |  |  | 184 |  | 82 | 82 | 184
Investment in Sunoco LP |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  | 0 |
Goodwill |  |  |  |  |  |  |  |  | 4 | 9 |
Goodwill |  |  | 1,568 | 1,564 |  |  | 1,555 |  | 1,568 | 1,564 | 1,555
Retail Marketing [Member] |  |  |  |  |  |  |  |  |  |  |
Excise Taxes Collected |  |  |  |  |  |  |  |  | 332 | 301 | 386
Interstate Transportation and Storage |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  | 58 |
Impairment losses |  |  |  |  | (43) | (183) |  |  |  | (226) |
Goodwill |  |  |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 226 |  | 0 | 0 | 226
Investment in USAC |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ (619) |  |  |  | (619) |
Goodwill |  |  |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 619 |  | 0 | 0 | 619
Crude Oil Transportation and Services |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  | $ (1,280) |  |  |  |  | (1,279) |
Goodwill |  |  |  |  |  |  |  |  | 138 | 0 |
Goodwill |  |  | 190 | 52 |  |  | 1,397 |  | 190 | 52 | 1,397
Intrastate Transportation and Storage |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | (10) |  |  |  |  |  | (10) |
Goodwill |  |  |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 10 |  | 0 | 0 | 10
Sunoco LP [Member] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  |  |  | 47
Long-term Debt |  |  | 3,255 | 3,112 |  |  |  |  | 3,255 | 3,112 |
USAC [Member] |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  |  |  |  | 5 | $ 8 | $ 6
PEI [Member] | All Other |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | $ (11) |  |  |  |  |  |  |
ETC Marketing | All Other |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 72 |  |  |  |  |  | $ 72 |  |
SemGroup [Member] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 295 |  |  |  |  | $ 265 |  |  |  |
Enable |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value | $ 3,430 |  |  |  |  |  |  |  |  |  |
Goodwill | $ 138 |  | 138 |  |  |  |  |  |  |  |
Sunoco LP [Member] |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 4 |  |  |  |  |  |  |  |

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