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Investments in Unconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]  
Investments in Unconsolidated Affiliates
The following table summarizes our investments in unconsolidated affiliates:
  Carrying Value as of
 Percentage
Ownership		September 30,
2020		December 31, 2019
  (millions)
DCP Sand Hills Pipeline, LLC66.67%$1,742 $1,764 
DCP Southern Hills Pipeline, LLC66.67%732 738 
Front Range Pipeline LLC33.33%201 206 
Gulf Coast Express LLC25.00%438 449 
Texas Express Pipeline LLC10.00%97 101 
Mont Belvieu Enterprise Fractionator12.50%27 27 
Mont Belvieu 1 Fractionator20.00%7 9 
Discovery Producer Services LLC40.00%248 322 
Cheyenne Connector50.00%153 83 
Panola Pipeline Company, LLC15.00%21 22 
OtherVarious2 3 
Total investments in unconsolidated affiliates$3,668 $3,724 
Schedule Of Earnings From Investment In Unconsolidated Affiliates [Table Text Block] :
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (millions)
DCP Sand Hills Pipeline, LLC$73 $72 $221 $212 
DCP Southern Hills Pipeline, LLC19 17 59 62 
Front Range Pipeline LLC9 7 29 23 
Gulf Coast Express LLC17 8 49 8 
Texas Express Pipeline LLC4 3 13 12 
Mont Belvieu Enterprise Fractionator4 3 10 10 
Mont Belvieu 1 Fractionator3 3 9 11 
Discovery Producer Services LLC (a)(3)1 (63)4 
Cheyenne Connector3 — 3 — 
Other1 — 1 2 
Total earnings from unconsolidated affiliates$130 $114 $331 $344 
Equity Method Investment Summarized Financial Information, Statement of Operations [Table Text Block]
The following tables summarize the combined financial information of our investments in unconsolidated affiliates:
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
 (millions)
Statements of operations:
Operating revenue$523 $438 $1,560 $1,291 
Operating expenses$196 $167 $572 $520 
Net income$326 $271 $985 $771 
Equity Method Investment Summarized Financial Information Balance Sheet Table [Table Text Block]
 September 30,
2020		December 31,
2019
 (millions)
Balance sheets:
Current assets$347 $463 
Long-term assets7,564 7,546 
Current liabilities(165)(231)
Long-term liabilities(258)(252)
Net assets$7,488 $7,526