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Estimates (Schedule of Other Non-Current Assets, net) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Regulatory assets $ 43   $ 85
Deferred charges 241   210
Restricted funds 178   192
Other 544   399
Total other non-current assets, net $ 1,006 $ 925 $ 886