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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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