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Estimates (Schedule of Other Non-Current Assets, net) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Regulatory assets $ 42 $ 43
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 84 68
Deferred charges 178 173
Restricted funds 178 178
Other 593 544
Total other non-current assets, net $ 1,075 $ 1,006