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Investments in Affiliates (Summarized Income Statement Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Revenues $ 1,249 [1] $ 1,358 $ 1,164
Equity Method Investments Summarized Financial Information, Operating Income 723 [1] 407 714
Net income 460 [1] 145 384
Equity in earnings of unconsolidated affiliates 344 144 270
Citrus [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates 141 144 102
FEP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates 55 53 51
MEP [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates 31 38 40
RIGS Haynesville Partnership Co. [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates [2] 3 (168) 31
Other Affiliates [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated affiliates $ 114 $ 77 $ 46
[1] Selected balance sheet data as of December 31, 2018 does not include HPC and selected income data 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.
[2] For the year ended December 31, 2017, equity in earnings (losses) of unconsolidated affiliates includes the impact of non-cash impairments recorded by HPC, which reduced the Partnership’s equity in earnings by $185 million.