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Guarantees and Indemnifications (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2023 | Feb. 28, 2021 | Dec. 31, 2020 | Jul. 31, 2020 | Oct. 31, 2017
Noncurrent Liabilities |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Face value of guarantees | $ 2 | $ 2 |  |  |  |
Letters of credit |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum potential amount of future payments associated with guarantees |  | 411 |  |  |  |
ACP |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 1,900 | $ 3,400
ACP | Atlantic Coast Pipeline (ACP) |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Off-balance sheet, credit loss, liability |  |  |  | $ 95 |  |
ACP | Atlantic Coast Pipeline (ACP) | Current Liabilities |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantor obligations settled |  |  | $ 855 |  |  |
Performance guarantee | Customers and other third parties |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum potential amount of future payments associated with guarantees |  | 26 |  |  |  |
Performance guarantee | Spectra Capital |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum potential amount of future payments associated with guarantees |  | $ 33 |  |  |  |
Financial guarantee | ACP |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum potential amount of future payments associated with guarantees |  |  |  | $ 860 |  |
Maximum exposure (as a percent) | 47.00% |  |  |  |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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