Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2020
Balance as of beginning of period	$	5
Increase in provision	2
Amounts written off	(3		)
Recoveries	2
Balance as of end of period	$	6

Schedule of Other Current Assets [Table Text Block]

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

	March 31, 2020		December 31, 2019
Prepaid expenses	$	64	$	63
Assets from price risk management activities	25		25
Margin deposits	35		16
Other current assets	$	124	$	104

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

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

	March 31, 2020			December 31, 2019
Electric utility plant	$	11,033		$	10,928
Construction work-in-progress	356			328
Total cost	11,389			11,256
Less: accumulated depreciation and amortization	(4,172		)	(4,095		)
Electric utility plant, net	$	7,217		$	7,161

Schedule of Regulatory Assets and Liabilities [Text Block]

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

	March 31, 2020					December 31, 2019
	Current			Noncurrent		Current			Noncurrent
Regulatory assets:
Price risk management	$	7		$	124	$	—		$	95
Pension and other postretirement plans	—			208		—			213
Debt issuance costs	—			25		—			26
Trojan decommissioning activities	—			95		—			94
Other	14			61		17			55
Total regulatory assets	$	21		$	513	$	17		$	483
Regulatory liabilities:
Asset retirement removal costs	$	—		$	1,033	$	—		$	1,021
Deferred income taxes	—			259		—			260
Asset retirement obligations	—			54		—			54
Tax Reform deferral	17			—		23			—
Other	23			44		21			42
Total regulatory liabilities	$	40	*	$	1,390	$	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):

	March 31, 2020		December 31, 2019
Accrued employee compensation and benefits	$	48	$	74
Accrued taxes payable	31		33
Accrued interest payable	41		25
Accrued dividends payable	36		36
Regulatory liabilities—current	40		44
Other	100		103
Total accrued expenses and other current liabilities	$	296	$	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 March 31,
	2020			2019
Service cost	$	4		$	4
Interest cost*	8			8
Expected return on plan assets*	(11		)	(10		)
Amortization of net actuarial loss*	4			3
Net periodic benefit cost	$	5		$	5

* The expense portion of non-service cost components are included in Miscellaneous (loss) income, net within Other income on the Company’s condensed consolidated statements of income and comprehensive income.