Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Utility plant, net	$ 9,334	$ 8,915
Receivables, customer, allowance for uncollectible accounts	10	3
Total current assets	1,039	1,118
Total deferred debits and other assets	$ 3,829	$ 3,985
Common stock, par value	$ 0	$ 0
Common stock, shares outstanding	40.3	40.3
Variable Interest Entity, Primary Beneficiary [Member]
Utility plant, net	$ 730	$ 727
Total current assets	103	143
Total deferred debits and other assets	$ 35	$ 32