Regulatory Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Regulated Operations [Abstract]

Schedule of Current and Non-Current Regulatory Assets

Current and non-current regulatory assets as of September 30, 2018 and December 31, 2017, respectively, consisted of:

	September 30,		December 31,
As of	2018		2017
(Millions)
Current
Pension and other post-retirement benefits cost deferrals	$	24	$	24
Pension and other post-retirement benefits	12		7
Storm costs	65		46
Rate adjustment mechanism	17		—
Reliability support services	19		27
Revenue decoupling mechanism	10		21
Transmission revenue reconciliation mechanism	7		8
Electric supply reconciliation	7		—
Hedges losses	—		3
Contracts for differences	8		9
Hardship programs	13		14
Deferred property tax	10		10
Plant decommissioning	6		6
Deferred purchased gas	12		31
Deferred transmission expense	16		37
Environmental remediation costs	14		13
Other	44		51
Total Current Regulatory Assets	284		307
Non-current
Pension and other post-retirement benefits cost deferrals	116		110
Pension and other post-retirement benefits	1,035		1,162
Storm costs	296		254
Deferred meter replacement costs	27		29
Unamortized losses on reacquired debt	16		17
Environmental remediation costs	270		283
Unfunded future income taxes	369		376
Asset retirement obligation	19		18
Deferred property tax	—		14
Federal tax depreciation normalization adjustment	152		155
Merger capital expense target customer credit	1		2
Debt premium	120		131
Reliability support services	—		10
Plant decommissioning	7		9
Contracts for differences	90		84
Hardship programs	9		13
Deferred income taxes regulatory	44		—
Other	64		71
Total Non-current Regulatory Assets	$	2,635	$	2,738

Schedule of Current and Non-Current Regulatory Liabilities

Current and non-current regulatory liabilities as of September 30, 2018 and December 31, 2017, respectively, consisted of:

	September 30,		December 31,
As of	2018		2017
(Millions)
Current
Non by-passable charges	$	6	$	5
Energy efficiency portfolio standard	56		37
Gas supply charge and deferred natural gas cost	2		4
Transmission revenue reconciliation mechanism	6		14
Pension and other post-retirement benefits	—		1
Pension and other post-retirement benefits cost deferrals	14		14
Carrying costs on deferred income tax bonus depreciation	23		21
Carrying costs on deferred income tax - Mixed Services 263(a)	5		5
Yankee DOE Refund	—		4
Merger related rate credits	—		1
Revenue decoupling mechanism	4		4
Stranded costs	3		17
Hedges gains	7		—
Other	68		51
Total Current Regulatory Liabilities	194		178
Non-current
Accrued removal obligations	1,145		1,132
2017 Tax Act	1,566		1,515
Asset sale gain account	10		10
Carrying costs on deferred income tax bonus depreciation	55		72
Economic development	28		32
Merger capital expense target customer credit account	6		6
Pension and other post-retirement benefits cost deferrals	63		74
Positive benefit adjustment	37		39
New York state tax rate change	4		6
Theoretical reserve flow thru impact	15		19
Deferred property tax	24		19
Net plant reconciliation	19		10
Variable rate debt	42		33
Carrying costs on deferred income tax - Mixed Services 263(a)	16		20
Rate refund – FERC ROE proceeding	27		27
Transmission congestion contracts	21		19
Merger-related rate credits	18		20
Accumulated deferred investment tax credits	13		13
Asset retirement obligation	12		13
Earning sharing provisions	17		22
Middletown/Norwalk local transmission network service collections	18		19
Excess generation service charge	10		2
Low income programs	35		42
Non-firm margin sharing credits	13		8
Deferred income taxes regulatory	—		13
Other	71		67
Total Non-current Regulatory Liabilities	$	3,285	$	3,252