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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2022 | Dec. 02, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Impairment losses and other |  |  |  |  |  |  | $ 386 | $ 21 | $ 2,880
Asset Retirement Obligation |  |  | $ 369 |  |  |  | 362 | 369 |
Costs Incurred, Asset Retirement Obligation Incurred |  |  |  |  |  |  | 4 | 12 | 16
Asset Retirement Obligation, Legally Restricted Assets, Fair Value |  |  | 39 |  |  |  | 27 | 39 |
Long-term Debt, Fair Value |  |  | 54,970 |  |  |  | 45,420 | 54,970 |
Goodwill |  |  |  |  |  |  | 33 | 142 |
Goodwill |  |  | 2,533 | $ 2,391 |  |  | 2,566 | 2,533 | 2,391
Long-term Debt |  |  | 49,702 |  |  |  | 48,262 | 49,702 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  |  |  |  |  |  | 0 |  |
Inventory Write-down |  |  |  |  |  |  | 5 | 190 | 82
Inventory Valuation Reserves |  |  | 121 |  |  |  | 116 | 121 |
Impairment of investment in unconsolidated affiliates |  |  |  |  |  |  | 0 | 0 | 129
Revenue from Related Parties |  |  |  |  |  |  | 391 | 410 | 466
Reporting units for which the estimated FV exceeds the carrying value by less than 20% |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 368 |  |
White Cliffs |  |  |  |  |  |  |  |  |
Impairment of investment in unconsolidated affiliates |  |  |  |  |  |  |  | 129 | 129
Midstream |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ (483) |  |  |
Goodwill |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 0 | 0 | 0
All Other |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | (15) | $ (132) | (40) |  |  |
Goodwill |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 82 | 82 |  |  | 82 | 82 | 82
Investment in Sunoco LP |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 33 | 4 |
Goodwill |  |  | 1,568 | 1,564 |  |  | 1,601 | 1,568 | 1,564
Retail Marketing [Member] |  |  |  |  |  |  |  |  |
Excise Taxes Collected |  |  |  |  |  |  | 285 | 332 | 301
Interstate Transportation and Storage |  |  |  |  |  |  |  |  |
Impairment losses and other |  |  |  |  |  |  |  |  | 58
Impairment losses |  |  |  |  | (43) | (183) |  |  |
Goodwill |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 0 | 0 | 0
Investment in USAC |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  |  | $ (619) |  |  |
Goodwill |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 0 | 0 | 0
Crude Oil Transportation and Services |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  |  | $ (1,280) |  |  |  |
Goodwill |  |  |  |  |  |  | 0 | 138 |
Goodwill |  |  | 190 | 52 |  |  | 190 | 190 | 52
Intrastate Transportation and Storage |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | (10) |  |  |  |  |
Goodwill |  |  |  |  |  |  | 0 | 0 |
Goodwill |  |  | 0 | 0 |  |  | 0 | 0 | 0
Sunoco LP [Member] |  |  |  |  |  |  |  |  |
Goodwill | $ 20 |  |  |  |  |  |  |  |
Long-term Debt |  |  | 3,255 |  |  |  | 3,571 | 3,255 |
USAC [Member] |  |  |  |  |  |  |  |  |
Impairment losses and other |  |  |  |  |  |  | 1 | $ 5 | $ 8
PEI [Member] | All Other |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | $ (11) |  |  |  |  |
Enable |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  | $ 3,430 |  |  |  |  |  |  |
Goodwill |  | $ 138 | 138 |  |  |  |  |  |
Sunoco LP [Member] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 4 |  |  |  | $ 33 |  |

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