Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2019

Balance Sheet Components [Abstract]

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

The following is the activity in the allowance for uncollectible accounts (in millions):  

	Years Ended December 31,
	2019			2018			2017
Balance as of beginning of year	$	15		$	6		$	6
Increase in provision	2			14			6
Amounts written off, less recoveries	(12		)	(5		)	(6		)
Balance as of end of year	$	5		$	15		$	6

Schedule of Other Assets and Other Liabilities [Table Text Block]

Other current assets and Accrued expenses and other current liabilities consist of the following (in millions):

	As of December 31,
	2019		2018
Other current assets:
Prepaid expenses	$	63	$	54
Margin deposits	16		16
Assets from price risk management activities	25		20
	$	104	$	90
Accrued expenses and other current liabilities:
Regulatory liabilities—current	$	44	$	36
Accrued employee compensation and benefits	74		66
Accrued dividends payable	36		34
Accrued interest payable	25		27
Accrued taxes payable	33		34
Other	103		71
	$	315	$	268

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

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

	As of December 31,
	2019			2018
Electric utility plant:
Generation	$	4,749		$	4,600
Transmission	848			580
Distribution	3,917			3,838
General	656			611
Intangible	758			715
Total in service	10,928			10,344
Accumulated depreciation and amortization	(4,095		)	(3,803		)
Total in service, net	6,833			6,541
Construction work-in-progress	328			346
Electric utility plant, net	$	7,161		$	6,887