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CONSOLIDATED BALANCE SHEET (UNAUDITED) (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts receivable - customers, allowance for uncollectible accounts | $ 313 | $ 148
Other receivables, allowance for uncollectible accounts | 7 | 7
Non-utility property, accumulated depreciation | 590 | 522
Intangible assets, accumulated amortization | 273 | 228
Subsidiaries |  |
Accounts receivable - customers, allowance for uncollectible accounts | 300 | 138
Other receivables, allowance for uncollectible accounts | 5 | 4
Non-utility property, accumulated depreciation | $ 25 | $ 25

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