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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for doubtful accounts | $ 59 | $ 64
Common stock, shares authorized (in shares) | 800,000,000 | 800,000,000
Common stock, shares outstanding (in shares) | 516,003,957 | 514,755,845
Pacific Gas & Electric Co |  |
Allowance for doubtful accounts | $ 59 | $ 64
Common stock, par value (in dollars per share) | $ 5 | $ 5
Common stock, shares authorized (in shares) | 800,000,000 | 800,000,000
Common stock, shares outstanding (in shares) | 264,374,809 | 264,374,809

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