Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Utility plant, net	$ 9,402	$ 9,334
Receivables, customer, allowance for uncollectible accounts	9	10
Total current assets	981	1,039
Total deferred debits and other assets	$ 3,800	$ 3,829
Common stock, par value	$ 0	$ 0
Common stock, shares outstanding	40.3	40.3
Variable Interest Entity, Primary Beneficiary [Member]
Utility plant, net	$ 726	$ 730
Total current assets	96	103
Total deferred debits and other assets	$ 36	$ 35