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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction                      
Interest income — affiliates $ 16 $ 6 $ 1 $ 0 $ 6 $ 5 $ 7 $ 5 $ 23 $ 23 $ 9
Income (loss) from unconsolidated affiliates $ 0 $ 28 $ (6) $ 4 $ (19) $ 9 $ 6 $ (8) 26 (12) 15
Southern Union                      
Related Party Transaction                      
Revenue from Related Parties                 18 33 56
Interest income — affiliates                 23 23 9
Affiliated Entity                      
Related Party Transaction                      
Cost of natural gas and other energy                 0 0 17
Related Party Transaction, Expenses from Transactions with Related Party                 16 16 0
Related Party Operating, Maintenance and General Expenses                 31 33 71
Interest expense, net                 0 0 (31)
Income (loss) from unconsolidated affiliates                 $ 26 $ (12) $ 15