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Variable Interest Entities (Schedule of Non-Consolidated VIE Pipeline Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | $ 1,409 | $ 1,175 | $ 925
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | $ 1,060 | 919 |
Constitution Pipeline [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 24.00% |  |
Investments in equity method unconsolidated affiliates | $ 25 | 81 |
Sabal Trail Transmission Pipeline [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | $ 112 |  |
Sabal Trail Transmission Pipeline [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 7.50% |  |
Investments in equity method unconsolidated affiliates |  | 219 |
Atlantic Coast Pipeline [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 47.00% |  |
Investments in equity method unconsolidated affiliates | $ 797 | 397 |
Pipeline Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 822 | 697 |
Gas Utilities and Infrastructure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 1,003 | 763 | $ 566
Gas Utilities and Infrastructure [Member] | Constitution Pipeline [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
OTTI impairment loss | 55 |  |
Gas Utilities and Infrastructure [Member] | Sabal Trail Transmission Pipeline [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | $ 112 | $ 219 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=108788376&loc=SL6759159-111685 + Details
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