Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2011

Regulatory Matters [Abstract]

Regulatory Assets And Liabilities

	Con Edison				CECONY
(millions of dollars)	2011		2010		2011		2010
Regulatory assets
Unrecognized pension and other postretirement costs	$	5,852	$	4,371	$	5,554	$	4,152
Future income tax		1,798		1,592		1,724		1,514
Environmental remediation costs		681		695		564		574
Pension and other post retirement benefits deferrals		198		138		157		90
Revenue taxes		163		145		158		140
Deferred storm costs		128		57		80		43
Net electric deferrals		121		156		121		156
Surcharge for New York State assessment		90		121		82		112
Deferred derivative losses – long-term		60		74		44		48
O&R transition bond charges		44		48		—		—
Workers' compensation		23		31		23		31
Recoverable energy costs – long-term		14		42		14		42
Property tax reconciliation		13		34		—		26
World Trade Center restoration costs		5		45		5		45
Other		147		134		135		124
Regulatory assets – long-term		9,337		7,683		8,661		7,097
Deferred derivative losses – current		164		190		140		151
Recoverable energy costs – current		—		13		—		—
Regulatory assets – current		164		203		140		151
Total Regulatory Assets	$	9,501	$	7,886	$	8,801	$	7,248
Regulatory liabilities
Allowance for cost of removal less salvage	$	448	$	422	$	372	$	350
Net unbilled revenue deferrals		104		136		104		136
World Trade Center settlement proceeds		62		—		62		—
Carrying charges on transmission and distribution net plant		38		28		14		5
Bonus depreciation		35		1		34		1
Property tax reconciliation		35		—		35		—
Long-term interest rate reconciliation		30		13		30		13
Energy efficiency programs		22		12		20		11
Gas line losses		21		—		21		—
New York State tax refund		20		30		20		30
Gain on sale of properties		14		28		14		28
Expenditure prudence proceeding		11		—		11		—
Other		137		118		124		109
Regulatory liabilities – long-term		977		788		861		683
Revenue decoupling mechanism		66		38		66		38
Refundable energy costs – current		51		117		12		90
Deferred derivative gains – current		1		4		1		3
Regulatory liabilities – current		118		159		79		131
Total Regulatory Liabilities	$	1,095	$	947	$	940	$	814