Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

The cash equivalents were as follows:



	Edison International				SCE
	December 31,
(in millions)	2017		2016		2017		2016
Money market funds	$	1,024	$	41	$	483	$	18

Cash is temporarily invested until required for check clearing. Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows:



	Edison International				SCE
	December 31,
(in millions)	2017		2016		2017		2016
Book balances reclassified to accounts payable	$	64	$	138	$	63	$	136

Estimated Useful Lives (Authorized by the CPUC) and Weighted-Average Useful Lives of Property, Plant and Equipment

Estimated useful lives (authorized by the CPUC) and weighted-average useful lives of SCE's property, plant and equipment, are as follows:



	Estimated Useful Lives	Weighted-Average Useful Lives
Generation plant	10 years to 55 years	37 years
Distribution plant	20 years to 60 years	43 years
Transmission plant	40 years to 65 years	52 years
General plant and other	5 years to 60 years	22 years

Reconciliation of the Changes in ARO Liability

The following table summarizes the changes in SCE's ARO liability, including San Onofre Nuclear Generating Station ("San Onofre") and Palo Verde:



	December 31,
(in millions)	2017			2016
Beginning balance	$	2,586		$	2,762
Accretion¹	166			157
Revisions	376			(165		)
Liabilities settled	(236		)	(168		)
Ending balance	$	2,892		$	2,586


¹	An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting.

Amortization of Deferred Financing Costs

Amortization of deferred financing costs charged to interest expense is as follows:



	Edison International						SCE
	Years ended December 31,
(in millions)	2017		2016		2015		2017		2016		2015
Amortization of deferred financing costs charged to interest expense	$	30	$	31	$	33	$	27	$	27	$	28

EPS Attributable to Edison International Common Shareholders

EPS attributable to Edison International common shareholders was computed as follows:



	Years ended December 31,
(in millions, except per-share amounts)	2017		2016		2015
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	565	$	1,299	$	985
Participating securities dividends	—		—		(1		)
Income from continuing operations available to common shareholders	$	565	$	1,299	$	984
Weighted average common shares outstanding	326		326		326
Basic earnings per share – continuing operations	$	1.73	$	3.99	$	3.02
Diluted earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	565	$	1,299	$	985
Participating securities dividends	—		—		(1		)
Income from continuing operations available to common shareholders	$	565	$	1,299	$	984
Income impact of assumed conversions	—		1		1
Income from continuing operations available to common shareholders and assumed conversions	$	565	$	1,300	$	985
Weighted average common shares outstanding	326		326		326
Incremental shares from assumed conversions	2		4		3
Adjusted weighted average shares – diluted	328		330		329
Diluted earnings per share – continuing operations	$	1.72	$	3.94	$	2.99