Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

The following table is a summary of SCE's revenue:



	Three months ended June 30, 2018						Three months ended June 30, 2017
(in millions)	Earning Activities		Cost- Recovery Activities		Total Consolidated		Earning Activities		Cost-Recovery Activities		Total Consolidated
Revenues from contracts with customers	$	1,534	$	1,146	$	2,680	*		*		*
Alternative revenue programs and other operating revenue	1		122		123		*		*		*
Total operating revenue	$	1,535	$	1,268	$	2,803	$	1,584	$	1,369	$	2,953

^* As discussed in Note 1, prior period amounts have not been adjusted under the modified retrospective method.



	Six months ended June 30, 2018									Six months ended June 30, 2017
(in millions)	Earning Activities			Cost- Recovery Activities			Total Consolidated			Earning Activities		Cost-Recovery Activities		Total Consolidated
Revenues from contracts with customers	$	3,070		$	2,338		$	5,408		*		*		*
Alternative revenue programs and other operating revenue	(22		)	(29		)	(51		)	*		*		*
Total operating revenue	$	3,048		$	2,309		$	5,357		$	3,136	$	2,273	$	5,409

^* As discussed in Note 1, prior period amounts have not been adjusted under the modified retrospective method.

Receivables, Accrued Unbilled Revenue and Contract Liabilities

The following table provides a summary of significant changes in SCE's contract liabilities:



(in millions)	2018
Balance at January 1,	$	20
Additions	25
Revenue recognized during the period	(25		)
Balance at June 30,	$	20

The following table provides information about SCE's receivables, accrued unbilled revenue and contract liabilities related to contracts from customers:



(in millions)	June 30, 2018		December 31, 2017
Receivables:
Billed revenue	$	693	$	613
Accrued unbilled revenues	598		212
Total receivables	$	1,291	$	825
Contract liabilities¹	$	20	$	20


¹	Contract liabilities are included in "Other current liabilities" and "Other deferred credits and long-term liabilities" on the consolidated balance sheets.

Activities in the Allowance for Doubtful Accounts

SCE's contract receivables are shown above, gross of allowance for uncollectible accounts. Activities in the allowance for doubtful accounts for SCE's contracts with customers were as follows:



(in millions)	2018
Balance at January 1,	$	36
Charged to costs and expenses	12
Write-offs	(12		)
Balance at June 30,	$	36