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Guarantees and Indemnifications (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jul. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Oct. 31, 2017
Guarantor Obligations [Line Items] |  |  |  |  |
Unused letters of credit | $ 76 |  |  |  |
Noncurrent Liabilities |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Face value of guarantees | 11 |  |  | $ 23 |
Off-balance sheet, credit loss, liability | 4 |  |  |  |
Letters of credit |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum potential amount of future payments associated with guarantees | 566 |  |  |  |
ACP |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 1,900 |  |  | $ 3,400
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Off-balance sheet, credit loss, liability |  |  | $ 95 |  |
Atlantic Coast Pipeline (ACP) | Current Liabilities | Atlantic Coast Pipeline (ACP) |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Face value of guarantees | 860 |  |  |  |
Performance guarantee |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum potential of future amounts associated with guarantees with expiration dates | 53 |  |  |  |
Performance guarantee | Customers and other third parties |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum potential amount of future payments associated with guarantees | 56 |  |  |  |
Performance guarantee | Spectra Capital |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum potential amount of future payments associated with guarantees | 56 |  |  |  |
Financial guarantee | ACP |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |
Maximum potential amount of future payments associated with guarantees | $ 860 |  |  |  |
Maximum exposure percentage | 47.00% |  |  |  |

X
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- Definition Maximum potential percentage of future payments the guarantor could be required to make under the guarantee in relationship to the total borrowings by the joint venture on the credit facility. + References No definition available. + Details
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- Definition Amount of unused capacity of bank-issued stand-by letters of credit to secure the performance of wholly owned and non-wholly owned entities to a third party or customer. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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