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Advances to and Investments in Unconsolidated Affiliates Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
[1]
Dec. 31, 2015
Impairment of investments in unconsolidated affiliates   $ 313 $ 308 $ 0 [1]
Impairment losses   1,039 1,040 339 [1]
Payments to Acquire Businesses, Gross $ 382      
Proceeds from the sale of other assets   48 35 14 [1]
Advances to and investments in unconsolidated affiliates   2,705 3,040 3,462
Goodwill   4,768 5,670 6,056
Equity in earnings from unconsolidated affiliates   $ 144 $ 270 $ 276 [1]
Citrus [Member]        
Interest ownership   50.00%    
Business Acquisition, Percentage of Voting Interests Acquired   50.00%    
FGT [Member]        
Percentage Ownership Operating Facility   100.00%    
Fayetteville Express Pipeline, LLC [Member]        
Interest ownership   50.00%    
FEP [Member]        
Impairment of investments in unconsolidated affiliates   $ 141    
Midcontinent Express Pipeline, LLC [Member]        
Interest ownership   50.00%    
RIGS Haynesville Partnership Co. [Member]        
Interest ownership   49.99%    
Impairment of investments in unconsolidated affiliates   $ (172)    
Impairment losses   $ 185    
[1] * As adjusted. See Note 2.