Advances to and Investments in Unconsolidated Affiliates Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Impairment of investments in unconsolidated affiliates	$ 0	$ 0	$ 313
Impairment losses	74	431	1,039
Advances to and investments in unconsolidated affiliates	3,460	2,642	2,705
Equity in earnings of unconsolidated affiliates	$ 302	$ 344	$ 144
Citrus [Member]
Interest ownership	50.00%
Business Acquisition, Percentage of Voting Interests Acquired	50.00%
FGT [Member]
Percentage Ownership Operating Facility	100.00%
FEP [Member]
Interest ownership	50.00%
Impairment of investments in unconsolidated affiliates	$ 141
Midcontinent Express Pipeline, LLC [Member]
Interest ownership	50.00%

The percentage of ownership of an operating facility by an investment in affiliate.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount of investment in equity method investee and investment in and advance to affiliate.

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