Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2020

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, 2020		Six Months Ended June 30, 2020
Balance as of beginning of period	$	6	$	5
Increase in provision	7		9
Amounts written off	(3)		(6)
Recoveries	2		4
Balance as of end of period	$	12	$	12

Schedule of Other Current Assets [Table Text Block]

Other current assets consist of the following (in millions):

	June 30, 2020		December 31, 2019
Prepaid expenses	$	37	$	63
Assets from price risk management activities	46		25
Margin deposits	25		16
Other current assets	$	108	$	104

Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]

Electric utility plant, net consists of the following (in millions):

	June 30, 2020		December 31, 2019
Electric utility plant	$	11,163	$	10,928
Construction work-in-progress	376		328
Total cost	11,539		11,256
Less: accumulated depreciation and amortization	(4,238)		(4,095)
Electric utility plant, net	$	7,301	$	7,161

Schedule of Regulatory Assets and Liabilities [Text Block]

Regulatory assets and liabilities consist of the following (in millions):

	June 30, 2020					December 31, 2019
	Current			Noncurrent		Current			Noncurrent
Regulatory assets:
Price risk management	$	—		$	135	$	—		$	95
Pension and other postretirement plans	—			204		—			213
Debt issuance costs	—			27		—			26
Trojan decommissioning activities	—			94		—			94
Other	12			66		17			55
Total regulatory assets	$	12		$	526	$	17		$	483
Regulatory liabilities:
Asset retirement removal costs	$	—		$	996	$	—		$	1,021
Deferred income taxes	—			256		—			260
Asset retirement obligations	—			55		—			54
Tax Reform deferral	12			—		23			—
Other	28			55		21			42
Total regulatory liabilities	$	40	*	$	1,362	$	44	*	$	1,377

* 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, 2020		December 31, 2019
Accrued employee compensation and benefits	$	63	$	74
Accrued taxes payable	31		33
Accrued interest payable	27		25
Accrued dividends payable	36		36
Regulatory liabilities—current	40		44
Other	92		103
Total accrued expenses and other current liabilities	$	289	$	315

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,
	2020		2019		2020		2019
Service cost	$	4	$	4	$	8	$	8
Interest cost*	8		9		16		17
Expected return on plan assets*	(11)		(10)		(22)		(20)
Amortization of net actuarial loss*	4		2		8		5
Net periodic benefit cost	$	5	$	5	$	10	$	10

* 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.