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Investments in Affiliates (Summarized Income Statement Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Revenues $ 1,192 $ 1,249 [1] $ 1,358
Equity Method Investments Summarized Financial Information, Operating Income 683 723 [1] 407
Net income 443 460 [1] 145
Equity in earnings of unconsolidated affiliates 302 344 144
Citrus [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates 148 141 144
FEP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates 59 55 53
MEP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates 15 31 38
Other Affiliates [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates $ 80 $ 117 $ (91)
[1]
Selected income data related to HPC for the year ended December 31, 2018 reflects HPC’s results for January 1, 2018 through March 31, 2018. HPC was fully consolidated beginning April 1, 2018 as discussed above.