Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019		2018
Balance as of beginning of year	$	5	$	15	$	6
Increase in provision *	15		2		14
Amounts written off, less recoveries	(4)		(12)		(5)
Balance as of end of year	$	16	$	5	$	15

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,
	2020		2019
Other current assets:
Prepaid expenses	$	57	$	63
Margin deposits	8		16
Assets from price risk management activities	33		25
	$	98	$	104
Accrued expenses and other current liabilities:
Regulatory liabilities—current	$	23	$	44
Accrued employee compensation and benefits	67		74
Accrued dividends payable	38		36
Accrued interest payable	29		25
Accrued taxes payable	36		33
Other	129		103
	$	322	$	315

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

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

	As of December 31,
	2020		2019
Electric utility plant:
Generation	$	4,436	$	4,749
Transmission	970		848
Distribution	4,136		3,917
General	679		656
Intangible	753		758
Total in service	10,974		10,928
Accumulated depreciation and amortization	(3,864)		(4,095)
Total in service, net	7,110		6,833
Construction work-in-progress	429		328
Electric utility plant, net	$	7,539	$	7,161