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Asset Impairment Expense (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 12, 2019
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | $ 864 | $ 185 | $ 208 |
Other Asset Impairment Charges |  | $ 849 | $ 69 | $ 116 | 864 | 185 | 208 |
Long-Lived Assets |  |  | 22,822 |  | 23,103 | 22,822 |  |
Hawaii Subsidiary [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  | $ 38 |  |  | 38 | 60 | 0 |
Kilroot and Ballylumford [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | 0 | 115 | 0 |
Assets carrying amount |  |  | $ 114 |  |  | 114 |  |
Shady Point [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | 0 | 0 | 157 |
Assets carrying amount |  |  |  |  |  |  | 30 |
Nejapa [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | 0 | 0 | 37 |
Assets carrying amount |  |  |  |  |  |  | $ 5 |
Long Lived Assets Held And Used [Member] | Hawaii Subsidiary [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  | 60 |  |  |
Assets carrying amount |  |  |  |  | $ 103 |  |  |
Long Lived Assets Held And Used [Member] | Kilroot and Ballylumford [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [1] |  |  |  |  | 115 |  |
Assets carrying amount |  |  |  |  |  |  |  | $ 232
Long Lived Assets Held And Used [Member] | Nejapa [Member] |  |  |  |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |
Other Asset Impairment Charges | [2] |  |  |  |  | $ 60 |  |
[1] | Per the Company's policy, pre-tax loss is limited to the impairment of long-lived assets. Any additional loss will be recognized on completion of the sale. See Note 22—Asset Impairment Expense and Note 25—Held-for-Sale and Dispositions for further information.
[2] | See Note 22—Asset Impairment Expense for further information.(3)See Note 8—In vestments I n and Advances to Affiliates for further information.

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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