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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Schedule of Trust Investments [Line Items]    
Net Gains (Losses) on Trust Investments $ 128 $ (22)
Rabbi Trust [Member]    
Schedule of Trust Investments [Line Items]    
Proceeds from Sales [1] 44 25
Gross Realized Gains 1 2
Gross Realized Losses (1) (2)
Net Realized Gains (Losses) [2] 0 0
Unrealized Gain (Loss) on Securities 3 0
Net Gains (Losses) on Trust Investments 3 0
Power [Member]    
Schedule of Trust Investments [Line Items]    
Net Gains (Losses) on Trust Investments 126 (22)
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]    
Schedule of Trust Investments [Line Items]    
Proceeds from Sales [3] 453 372
Gross Realized Gains 45 24
Gross Realized Losses (19) (12)
Net Realized Gains (Losses) [4] 26 12
Unrealized Gain (Loss) on Securities 99 (34)
Net Gains (Losses) on Trust Investments $ 125 $ (22)
[1] Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] The cost of these securities was determined on the basis of specific identification.
[3] Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[4] The cost of these securities was determined on the basis of specific identification.