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Balance Sheet Components (Tables)
 9 Months Ended
Sep. 30, 2021
Balance Sheet Components [Abstract]  
Allowance for Credit Losses [Text Block] The following summarizes activity in the allowance for credit losses (in millions):
 Three Months Ended September 30,Nine Months Ended
September 30,
 20212021
Balance as of beginning of period$22 $16 
Increase in provision11 26 
Amounts written off(7)(19)
Recoveries1 4 
Balance as of end of period$27 $27 
Schedule of Other Current Assets [Table Text Block]
Other current assets consist of the following (in millions):
September 30, 2021December 31, 2020
Prepaid expenses$44 $57 
Assets from price risk management activities194 33 
Margin deposits5 8 
Other current assets$243 $98 
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]
Electric utility plant, net consists of the following (in millions):             
September 30, 2021December 31, 2020
Electric utility plant$11,334 $10,974 
Construction work-in-progress503 429 
Total cost11,837 11,403 
Less: accumulated depreciation and amortization(4,064)(3,864)
Electric utility plant, net$7,773 $7,539 
Schedule of Regulatory Assets and Liabilities [Text Block]
Regulatory assets and liabilities consist of the following (in millions):
September 30, 2021December 31, 2020
CurrentNoncurrentCurrentNoncurrent
Regulatory assets:
Price risk management$— $11 $— $124 
Pension and other postretirement plans— 223 — 240 
Debt issuance costs— 24 — 25 
Trojan decommissioning activities— 99 — 95 
Incremental storm costs— 58 — — 
Power cost adjustment mechanism— 27 — — 
Wildfire— 36 — 15 
COVID-19— 27 — 10 
Other14 62 23 60 
Total regulatory assets$14 $567 $23 $569 
Regulatory liabilities:
Asset retirement removal costs$— $1,035 $— $1,016 
Deferred income taxes— 213 — 239 
Asset retirement obligations— 54 — 37 
Price risk management155 — 18 — 
Other32 68 5 77 
Total regulatory liabilities$187 
*
$1,370 $23 
*
$1,369 
* Included in Accrued expenses and other current liabilities in the condensed consolidated balance sheets.
Other Liabilities Disclosure [Text Block]
Accrued expenses and other current liabilities consist of the following (in millions):
September 30, 2021December 31, 2020
Accrued employee compensation and benefits$65 $67 
Accrued taxes payable58 36 
Accrued interest payable42 29 
Accrued dividends payable40 38 
Regulatory liabilities—current187 23 
Margin deposits from wholesale counterparties102 — 
Other117 129 
Total accrued expenses and other current liabilities$611 $322 
Pension and Other Postretirement Benefits Disclosure [Text Block]
Components of net periodic benefit cost under the defined benefit pension plan are as follows (in millions):
Three Months Ended September 30, Nine Months Ended September 30,
2021202020212020
Service cost$5 $4 $15 $12 
Interest cost*6 8 20 24 
Expected return on plan assets*(12)(11)(34)(33)
Amortization of net actuarial loss*6 4 16 12 
Net periodic benefit cost$5 $5 $17 $15 
* The net expense portion of non-service cost components are included in Miscellaneous income (expense), net within Other income on the Company’s condensed consolidated statements of income and comprehensive income.