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Investments, Loans and Long-Term Receivables (DCP Midstream, LLC) (Details) - DCP Midstream - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Noncash impairment, before-tax		$ 1,200
Difference between fair value and book value		$ 1,800
Amortization period			22 years
Equity investment, amortization of basis difference	$ 20		$ 30
Equity investments	$ 254		$ 254
DCP Partners
Schedule of Equity Method Investments [Line Items]
Equity method investment, decline in market value, percent		85.00%

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Amortization period for difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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