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Balance Sheet Components (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 2021
Balance as of beginning of period$16 
Increase in provision7 
Amounts written off(4)
Recoveries1 
Balance as of end of period$20 
Schedule of Other Current Assets [Table Text Block]
Other current assets consist of the following (in millions):
March 31, 2021December 31, 2020
Prepaid expenses$68 $57 
Assets from price risk management activities50 33 
Margin deposits9 8 
Other current assets$127 $98 
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]
Electric utility plant, net consists of the following (in millions):
March 31, 2021December 31, 2020
Electric utility plant$11,073 $10,974 
Construction work-in-progress472 429 
Total cost11,545 11,403 
Less: accumulated depreciation and amortization(3,929)(3,864)
Electric utility plant, net$7,616 $7,539 
Schedule of Regulatory Assets and Liabilities [Text Block] Regulatory assets and liabilities consist of the following (in millions):
March 31, 2021December 31, 2020
CurrentNoncurrentCurrentNoncurrent
Regulatory assets:
Price risk management$— $103 $— $124 
Pension and other postretirement plans— 234 — 240 
Debt issuance costs— 25 — 25 
Trojan decommissioning activities— 97 — 95 
Incremental storm costs— 41 — — 
Other25 91 23 85 
Total regulatory assets$25 $591 $23 $569 
Regulatory liabilities:
Asset retirement removal costs$— $1,020 $— $1,016 
Deferred income taxes— 222 — 239 
Asset retirement obligations— 38 — 37 
Price risk management30 — 18 — 
Other12 73 5 77 
Total regulatory liabilities$42 
(1)
$1,353 $23 
(1)
$1,369 
(1)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):
March 31, 2021December 31, 2020
Accrued employee compensation and benefits$48 $67 
Accrued taxes payable45 36 
Accrued interest payable43 29 
Accrued dividends payable37 38 
Regulatory liabilities—current42 23 
Other104 129 
Total accrued expenses and other current liabilities$319 $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 March 31,
20212020
Service cost$5 $4 
Interest cost*7 8 
Expected return on plan assets*(11)(11)
Amortization of net actuarial loss*5 4 
Net periodic benefit cost$6 $5 
* The expense portion of non-service cost components are included in Miscellaneous income (loss), net within Other income on the Company’s condensed consolidated statements of income and comprehensive income.