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Other Income and Expense (Nonoperating Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  | $ 19 |  | $ (54) |  | $ (27)
Other Income [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  | 46 | [1] | 0 |  | 0
Insured Event, Gain (Loss) |  | 0 |  | 118 | [2] | 0
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset |  | 0 |  | 0 |  |
Public Utilities, Allowance for Funds Used During Construction, Additions |  | 5 |  | 3 |  | 8
Other |  | 24 |  | 24 |  | 32
Other income |  | $ 75 |  | $ 145 |  | 72
Other Income [Member] | Na Pua Makani Power Partners [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Liquidation Basis of Accounting, Remeasurement, Gain (Loss) on Asset | [3] |  |  |  |  | $ 32
[1] | Primarily associated with the gain on sale of Redondo Beach land at Southland. See Note 25—Held-for-Sale and Dispositions for further information.
[2] | Associated with recoveries for property damage at the Andres facility in the Dominican Republic from a lightning incident in September 2018 and the upgrade of the tunnel lining at Changuinola.
[3] | Related to the amendment of the Oahu purchase agreement. See Note 26—Acquisitions for further information.

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