CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 306	$ 146
Customers (net of allowance for doubtful accounts)	1,817	1,883
Accrued unbilled revenue	1,140	1,083
Long-term debt	$ 35,959	$ 37,288
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	3,600,000,000	3,600,000,000
Common stock, shares outstanding (in shares)	1,985,369,201	1,984,678,673
Treasury stock, shares at cost (in shares)	477,743,590	0
Variable Interest Entity
Allowance for doubtful accounts	$ 306	$ 143
Customers (net of allowance for doubtful accounts)	1,590	1,630
Accrued unbilled revenue	1,030	959
Net non-current accounts receivable	271	0
Non-current allowance for doubtful accounts	51	0
Long-term debt	1,000	1,000
Pacific Gas & Electric Co (Utility)
Allowance for doubtful accounts	306	146
Customers (net of allowance for doubtful accounts)	1,817	1,883
Accrued unbilled revenue	1,140	1,083
Long-term debt	$ 31,366	$ 32,664
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
Pacific Gas & Electric Co (Utility) | Variable Interest Entity
Allowance for doubtful accounts	$ 306	$ 143
Customers (net of allowance for doubtful accounts)	1,590	1,630
Accrued unbilled revenue	1,030	959
Net non-current accounts receivable	271	0
Non-current allowance for doubtful accounts	51	0
Long-term debt	$ 1,000	$ 1,000