CONSOLIDATED BALANCE SHEET (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Accounts receivable - customers, allowance for uncollectible accounts	$ 275	$ 148
Other receivables, allowance for uncollectible accounts	7	7
Non-utility property, accumulated depreciation	555	522
Intangible assets, accumulated amortization	249	228
Subsidiaries
Accounts receivable - customers, allowance for uncollectible accounts	$ 262	138
Other receivables, allowance for uncollectible accounts		4
Non-utility property, accumulated depreciation		$ 25	$ 25