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Investments, Loans and Long-Term Receivables (DCP Midstream, LLC) (Details) - DCP Midstream
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]  
Equity method investment, decline in market value, percent 85.00%
Noncash impairment, before-tax $ 1,161
Equity investments 245
Difference between fair value and book value $ 1,795
Amortization period 22 years