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Estimates (Schedule of Other Non-Current Assets, net) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Unamortized financing costs(1) [1] $ 13 $ 29
Regulatory assets 86 90
Deferred charges 217 198
Restricted funds 190 192
Other 310 202
Total other non-current assets, net $ 816 $ 711
[1] (1)Includes unamortized financing costs related to the Partnership’s revolving credit facilities.