Defined Benefit Plan Disclosure [Line Items]

(in millions) Pension Benefits	2012		2011		2010
Service cost for benefits earned	$	396	$	320	$	279
Interest cost		658		660		645
Expected return on plan assets		(598)		(669)		(624)
Amortization of prior service cost		20		34		53
Amortization of unrecognized loss		123		50		44
Net periodic benefit cost		599		395		397
Less: transfer to regulatory account ⁽¹⁾		(301)		(139)		(233)
Total	$	298	$	256	$	164

⁽¹⁾ The Utility recorded $301 million, $139 million, and $233 million for the years ended December 31, 2012, 2011, and 2010, respectively, to a regulatory account as the amounts are probable of recovery from customers in future rates

(in millions) Other Benefits	2012		2011		2010
Service cost for benefits earned	$	49	$	42	$	36
Interest cost		83		91		88
Expected return on plan assets		(77)		(82)		(74)
Amortization of transition obligation		24		26		26
Amortization of prior service cost		25		27		25
Amortization of unrecognized loss (gain)		6		4		3
Net periodic benefit cost	$	110	$	108	$	104

Schedule Of Assumptions Used In Calculating Projected Benefit Cost And Net Periodic Benefit Cost

	Pension Benefits						Other Benefits
	December 31,						December 31,
	2012		2011		2010		2012		2011		2010
Discount rate	3.98	%	4.66	%	5.42	%	3.75 - 4.08	%	4.41 - 4.77	%	5.11 - 5.56	%
Average rate of future
compensation increases	4.00	%	5.00	%	5.00	%	-		-		-
Expected return on plan assets	5.40	%	5.50	%	6.60	%	2.90 - 6.10	%	4.40 - 5.50	%	5.20 - 6.60	%

Target Asset Allocation Percentages

	Pension Benefits						Other Benefits
	2013		2012		2011		2013		2012		2011
Global equity securities	25	%	35	%	5	%	28	%	38	%	3	%
U.S. equity securities	-	%	-	%	26	%	-	%	-	%	28	%
Non-U.S. equity securities	-	%	-	%	14	%	-	%	-	%	15	%
Absolute return	5	%	5	%	5	%	4	%	4	%	4	%
Real assets	10	%	10	%	-	%	8	%	8	%	-	%
Extended fixed-income securities	3	%	3	%	-	%	-	%	-	%	-	%
Fixed-income securities	57	%	47	%	50	%	60	%	50	%	50	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

Schedule Of Level 3 Reconciliation

	Pension Benefits
	Absolute		Corporate		Other
(in millions)	Return		Fixed-Income		Fixed-Income		Real Assets		Total
Balance as of January 1, 2011	$	494	$	549	$	120	$	-	$	1,163
Actual return on plan assets:
Relating to assets still held at the reporting date		5		57		(2)		-		60
Relating to assets sold during the period		2		-		1		-		3
Purchases, issuances, sales, and settlements
Purchases		-		14		2		65		81
Settlements		(14)		(35)		(58)		-		(107)
Transfers out of Level 3		-		-		(63)		-		(63)
Balance as of December 31, 2011	$	487	$	585	$	-	$	65	$	1,137
Actual return on plan assets:
Relating to assets still held at the reporting date		26		28		-		12		66
Relating to assets sold during the period		-		(1)		-		-		(1)
Purchases, issuances, sales, and settlements
Purchases		-		12		-		208		220
Settlements		-		(13)		-		-		(13)
Balance as of December 31, 2012	$	513	$	611	$	-	$	285	$	1,409

	Other Benefits
	Absolute		Corporate		Other
(in millions)	Return		Fixed-Income		Fixed-Income		Real Assets		Total
Balance as of January 1, 2011	$	47	$	129	$	10		-	$	186
Actual return on plan assets:
Relating to assets still held at the reporting date		1		16		-		-		17
Relating to assets sold during the period		-		(2)		-		-		(2)
Purchases, issuances, sales, and settlements
Purchases		-		34		-		6		40
Settlements		(1)		(30)		(5)		-		(36)
Transfers out of Level 3		-		(146)		(5)		-		(151)
Balance as of December 31, 2011	$	47	$	1	$	-	$	6	$	54
Actual return on plan assets:
Relating to assets still held at the reporting date		2		-		-		1		3
Relating to assets sold during the period		-		-		-		-		-
Purchases, issuances, sales, and settlements
Purchases		-		1		-		21		22
Settlements		-		(1)		-		-		(1)
Balance as of December 31, 2012	$	49	$	1	$	-	$	28	$	78

Schedule Of Employer Contribution Expense

(in millions)
Year ended December 31,
2012	$	67
2011		65
2010		56