Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Basic and Diluted Earnings Per Share

For the three and nine months ended September 30, 2017 and 2016, basic and diluted EPS for Con Edison are calculated as follows:

	For the Three Months Ended September 30,		For the Nine Months Ended September 30,
(Millions of Dollars, except per share amounts/Shares in Millions)	2017	2016	2017	2016
Net income	$457	$497	$1,020	$1,039
Weighted average common shares outstanding – basic	307.8	304.5	306.2	299.1
Add: Incremental shares attributable to effect of potentially dilutive securities	1.5	1.4	1.5	1.4
Adjusted weighted average common shares outstanding – diluted	309.3	305.9	307.7	300.5
Net Income per common share – basic	$1.48	$1.63	$3.33	$3.47
Net Income per common share – diluted	$1.48	$1.62	$3.31	$3.46

Changes in Accumulated Other Comprehensive Income/(Loss)

For the three and nine months ended September 30, 2017 and 2016, changes to accumulated other comprehensive income/(loss) (OCI) for Con Edison and CECONY are as follows:

	For the Three Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2017	2016	2017	2016
Beginning balance, accumulated OCI, net of taxes (a)	$(27)	$(33)	$(7)	$(8)
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(1) for Con Edison in 2017 and 2016 (a)(b)	1	1	1	—
Current period OCI, net of taxes	1	1	1	—
Ending balance, accumulated OCI, net of taxes	$(26)	$(32)	$(6)	$(8)

	For the Nine Months Ended September 30,
	Con Edison		CECONY
(Millions of Dollars)	2017	2016	2017	2016
Beginning balance, accumulated OCI, net of taxes (a)	$(27)	$(34)	$(7)	$(9)
OCI before reclassifications, net of tax of $1 for Con Edison in 2017 and 2016	(2)	(1)	—	—
Amounts reclassified from accumulated OCI related to pension plan liabilities, net of tax of $(2) for Con Edison in 2017 and 2016 (a)(b)	3	3	1	1
Current period OCI, net of taxes	1	2	1	1
Ending balance, accumulated OCI, net of taxes	$(26)	$(32)	$(6)	$(8)

(a) Tax reclassified from accumulated OCI is reported in the income tax expense line item of the consolidated income statement.

(b) For the portion of unrecognized pension and other postretirement benefit costs relating to the Utilities, costs are recorded into, and amortized out of, regulatory assets instead of OCI. The net actuarial losses and prior service costs recognized during the period are included in the computation of total periodic pension and other postretirement benefit cost. See Notes E and F.