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Balance Sheet Components (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended
June 30,
 20212021
Balance as of beginning of period$20 $16 
Increase in provision8 15 
Amounts written off(8)(12)
Recoveries2 3 
Balance as of end of period$22 $22 
Schedule of Other Current Assets [Table Text Block]
Other current assets consist of the following (in millions):
June 30, 2021December 31, 2020
Prepaid expenses$51 $57 
Assets from price risk management activities125 33 
Margin deposits43 8 
Other current assets$219 $98 
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]
Electric utility plant, net consists of the following (in millions):             
June 30, 2021December 31, 2020
Electric utility plant$11,168 $10,974 
Construction work-in-progress510 429 
Total cost11,678 11,403 
Less: accumulated depreciation and amortization(3,985)(3,864)
Electric utility plant, net$7,693 $7,539 
Schedule of Regulatory Assets and Liabilities [Text Block] Regulatory assets and liabilities consist of the following (in millions):
June 30, 2021December 31, 2020
CurrentNoncurrentCurrentNoncurrent
Regulatory assets:
Price risk management$— $35 $— $124 
Pension and other postretirement plans— 229 — 240 
Debt issuance costs— 24 — 25 
Trojan decommissioning activities— 98 — 95 
Incremental storm costs— 52 — — 
Other20 105 23 85 
Total regulatory assets$20 $543 $23 $569 
Regulatory liabilities:
Asset retirement removal costs$— $1,028 $— $1,016 
Deferred income taxes— 219 — 239 
Asset retirement obligations— 39 — 37 
Price risk management70 — 18 — 
Other21 68 5 77 
Total regulatory liabilities$91 
*
$1,354 $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):
June 30, 2021December 31, 2020
Accrued employee compensation and benefits$51 $67 
Accrued taxes payable33 36 
Accrued interest payable27 29 
Accrued dividends payable40 38 
Regulatory liabilities—current91 23 
Other127 129 
Total accrued expenses and other current liabilities$369 $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 June 30, Six Months Ended June 30,
2021202020212020
Service cost$5 $4 $10 $8 
Interest cost*7 8 14 16 
Expected return on plan assets*(11)(11)(22)(22)
Amortization of net actuarial loss*5 4 10 8 
Net periodic benefit cost$6 $5 $12 $10 
* The 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.