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Advances to and Investments in Unconsolidated Affiliates Investment in Affiliates (Carrying Values) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity in earnings from unconsolidated affiliates $ 144 $ 270 [1] $ 276 [1]
Advances to and investments in unconsolidated affiliates 2,705 3,040 [1] 3,462
Citrus [Member]      
Equity in earnings from unconsolidated affiliates 144 102 97
Advances to and investments in unconsolidated affiliates 1,754 1,729  
FEP [Member]      
Equity in earnings from unconsolidated affiliates 53 51 55
Advances to and investments in unconsolidated affiliates 121 101  
MEP [Member]      
Equity in earnings from unconsolidated affiliates 38 40 45
Advances to and investments in unconsolidated affiliates 242 318  
RIGS Haynesville Partnership Co. [Member]      
Equity in earnings from unconsolidated affiliates [2] (168) 31 32
Advances to and investments in unconsolidated affiliates 28 382  
Other Affiliates [Member]      
Equity in earnings from unconsolidated affiliates 77 46 $ 47
Advances to and investments in unconsolidated affiliates $ 560 $ 510  
[1] * As adjusted. See Note 2.
[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.