Regulatory Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2017

Regulated Operations [Abstract]

Schedule of Current and Non-Current Regulatory Assets

Current and non-current regulatory assets as of March 31, 2017 and December 31, 2016, respectively, consisted of:

	March 31,		December 31,
As of	2017		2016
(Millions)
Current
Pension and other post-retirement benefits cost deferrals	$	23	$	22
Pension and other post-retirement benefits		7		7
Storm costs		40		40
Temporary supplemental assessment surcharge		3		4
Reliability support services		27		27
Revenue decoupling mechanism		13		15
Transmission revenue reconciliation mechanism		14		12
Electric supply reconciliation		—		13
Hedges losses		12		10
Contracts for differences		12		14
Hardship programs		16		16
Deferred property tax		10		10
Plant decommissioning		6		6
Deferred purchased gas		1		14
Deferred transmission expense		15		13
Environmental remediation costs		13		14
Other		36		48
Total Current Regulatory Assets		248		285
Non-current
Pension and other post-retirement benefits cost deferrals		129		134
Pension and other post-retirement benefits		1,285		1,320
Storm costs		232		187
Deferred meter replacement costs		31		32
Unamortized losses on reacquired debt		19		20
Environmental remediation costs		285		287
Unfunded future income taxes		536		542
Asset retirement obligation		16		18
Deferred property tax		29		33
Federal tax depreciation normalization adjustment		160		161
Merger capital expense target customer credit		11		11
Debt premium		146		151
Reliability support services		49		2
Plant decommissioning		14		14
Contracts for differences		68		61
Hardship programs		14		18
Other		87		100
Total Non-current Regulatory Assets	$	3,111	$	3,091

Schedule of Current and Non-Current Regulatory Liabilities

Current and non-current regulatory liabilities as of March 31, 2017 and December 31, 2016, respectively, consisted of:

	March 31,		December 31,
As of	2017		2016
(Millions)
Current
Reliability support services (Cayuga)	$	1	$	3
Non by-passable charges		9		22
Energy efficiency portfolio standard		47		45
Gas supply charge and deferred natural gas cost		14		6
Transmission revenue reconciliation mechanism		9		5
Pension and other post-retirement benefits		1		3
Other post-retirement benefits cost deferrals		14		14
Carrying costs on deferred income tax bonus depreciation		15		15
Carrying costs on deferred income tax - Mixed Services    263(a)		5		5
Yankee DOE Refund		22		24
Merger related rate credits		2		3
Revenue decoupling mechanism		3		9
Other		58		38
Total Current Regulatory Liabilities		200		192
Non-current
Accrued removal obligations		1,126		1,117
Asset sale gain account		9		9
Carrying costs on deferred income tax bonus depreciation		91		95
Economic development		34		35
Merger capital expense target customer credit account		14		15
Pension and other post-retirement benefits		72		76
Positive benefit adjustment		41		42
New York state tax rate change		8		9
Post term amortization		3		3
Theoretical reserve flow thru impact		23		24
Deferred property tax		18		19
Net plant reconciliation		10		10
Variable rate debt		28		28
Carrying costs on deferred income tax - Mixed Services    263(a)		24		25
Rate refund – FERC ROE proceeding		26		26
Transmission congestion contracts		18		18
Merger-related rate credits		20		21
Accumulated deferred investment tax credits		14		15
Asset retirement obligation		11		13
Earning sharing provisions		22		12
Middletown/Norwalk local transmission network service collections		19		19
Low income programs		48		46
Non-firm margin sharing credits		10		7
Deferred income taxes regulatory		574		565
Other		66		69
Total Non-current Regulatory Liabilities	$	2,329	$	2,318