Pension And Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011


	Pension Benefits						Other Postretirement Benefits
At December 31,	2011			2010			2011			2010
	*(millions of dollars)*
Change in Benefit Obligation
Projected benefit obligation at beginning of year	$	1,970		$	1,796		$	704		$	651
Service cost		35			35			5			5
Interest cost		107			110			37			39
Amendments		18			(7	)		7			—
Actuarial loss		176			179			36			42
Benefits paid (a)		(182	)		(146	)		(40	)		(39	)
Termination benefits		—			3			1			6

Projected benefit obligation at end of year	$	2,124		$	1,970		$	750		$	704

Change in Plan Assets
Fair value of plan assets at beginning of year	$	1,632		$	1,500		$	275		$	242
Actual return on plan assets		127			173			—			26
Company contributions		117			105			46			46
Benefits paid (a)		(182	)		(146	)		(40	)		(39	)

Fair value of plan assets at end of year	$	1,694		$	1,632		$	281		$	275

Funded Status at end of year (plan assets less plan obligations)	$	(430	)	$	(338	)	$	(469	)	$	(429	)

(a)	Other Postretirement Benefits paid is net of Medicare Part D subsidy receipts of $2 million in 2011 and $3 million in 2010.


	Pension Benefits						Other Postretirement Benefits
	2011			2010			2011			2010
	*(millions of dollars)*
Regulatory asset	$	794		$	655		$	243		$	193
Current liabilities		(6	)		(6	)		—			—
Pension benefit obligation		(424	)		(332	)		—			—
Other postretirement benefit obligations		—			—			(469	)		(429	)
Deferred income taxes, net		15			12			—			—
Accumulated other comprehensive loss, net of tax		24			17			—			—

Net amount recognized	$	403		$	346		$	(226	)	$	(236	)


	Pension Benefits					Other Postretirement Benefits
	2011		2010			2011			2010
	*(millions of dollars)*
Unrecognized net actuarial loss	$	822	$	692		$	247		$	208
Unamortized prior service cost (credit)		11		(8	)		(5	)		(17	)
Unamortized transition liability		—		—			1			2

Total	$	833	$	684		$	243		$	193

Accumulated other comprehensive loss ($24 million and $17 million, net of tax, at December 31, 2011 and 2010, respectively)	$	39	$	29		$	—		$	—
Regulatory assets		794		655			243			193

Total	$	833	$	684		$	243		$	193


	Pension Benefits									Other Postretirement Benefits
	2011			2010			2009			2011			2010			2009
	*(millions of dollars)*
Service cost	$	35		$	35		$	36		$	5		$	5		$	7
Interest cost		107			110			111			37			39			40
Expected return on plan assets		(128	)		(117	)		(101	)		(19	)		(16	)		(13	)
Amortization of prior service cost		—			—			—			(5	)		(5	)		(4	)
Amortization of net actuarial loss		47			42			56			14			13			16
Recognition of benefit contract		—			—			1			—			—			—
Plan amendments		—			1			—			—			—			—
Termination benefits		—			3			—			1			6			—

Net periodic benefit cost	$	61		$	74		$	103		$	33		$	42		$	46


	Pension Benefits						Other Postretirement Benefits
	2011			2010			2011			2010
Discount rate		5.00	%		5.65	%		4.90	%		5.60	%
Rate of compensation increase		5.00	%		5.00	%		5.00	%		5.00	%
Health care cost trend rate assumed for current year		—			—			8.00	%		7.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		—			—			5.00	%		5.00	%
Year that the cost trend rate reaches the ultimate trend rate		—			—			2017			2015


	1-Percentage- Point Increase		1-Percentage- Point Decrease
Increase (decrease) in total service and interest cost	$	2	$	(1	)
Increase (decrease) in postretirement benefit obligation	$	32	$	(28	)


	Pension Benefits									Other Postretirement Benefits
	2011			2010			2009			2011			2010			2009
Discount rate		5.65	%		6.40	%		6.50	%		5.60	%		6.30	%		6.50	%
Expected long-term return on plan assets		7.75	%		8.00	%		8.25	%		7.75	%		8.00	%		8.25	%
Rate of compensation increase		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%


	Fair Value Measurements at December 31, 2011
	*(millions of dollars)*
	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category
Pension Plan Assets:
Equity
Domestic (a)	$	411	$	165	$	221	$	25
International (b)		196		192		2		2
Fixed Income (c)		939		—		930		9
Other
Private Equity		64		—		—		64
Real Estate		65		—		—		65
Cash Equivalents (d)		19		19		—		—

Pension Plan Assets Subtotal		1,694		376		1,153		165

Other Postretirement Plan Assets:
Equity (e)		174		150		24		—
Fixed Income (f)		101		101		—		—
Cash Equivalents		6		6		—		—

Postretirement Plan Assets Subtotal		281		257		24		—

Total Pension and Other Postretirement Plan Assets	$	1,975	$	633	$	1,177	$	165

(a)	Predominantly includes domestic common stock and commingled funds.

(b)	Predominantly includes foreign common and preferred stock and warrants.

(c)	Predominantly includes corporate bonds, government bonds, municipal bonds, and commingled funds.

(d)	Predominantly includes cash investment in short term investment funds.

(e)	Includes domestic and international commingled funds.

(f)	Includes fixed income commingled funds.


	Fair Value Measurements at December 31, 2010
	(millions of dollars)
	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset Category
Pension Plan Assets:
Equity
Domestic (a)	$	573	$	334	$	212	$	27
International (b)		270		265		2		3
Fixed Income (c)		604		397		204		3
Other
Private Equity		62		—		—		62
Real Estate		55		—		—		55
Cash Equivalents (d)		68		68		—		—

Pension Plan Assets Subtotal		1,632		1,064		418		150

Other Postretirement Plan Assets:
Equity (e)		168		145		23		—
Fixed Income (f)		96		96		—		—
Cash Equivalents		11		11		—		—

Postretirement Plan Assets Subtotal		275		252		23		—

Total Pension and Other Postretirement Plan Assets	$	1,907	$	1,316	$	441	$	150

(a)	Predominantly includes domestic common stock and commingled funds.

(b)	Predominantly includes foreign common and preferred stock and warrants.

(c)	Predominantly includes corporate bonds, government bonds, municipal/provincial bonds, collateralized mortgage obligations, asset backed securities and commingled funds.

(d)	Predominantly includes cash investment in short term investment funds.

(e)	Includes domestic and international commingled funds.

(f)	Includes fixed income commingled funds.


	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	*(millions of dollars)*
	Equity			Fixed Income			Private Equity			Real Estate			Total Level 3
Beginning balance as of January 1, 2011	$	30		$	3		$	62		$	55		$	150
Transfer in (out) of Level 3		—			—			—			—			—
Purchases		2			—			11			9			22
Sales		(5	)		(1	)		—			—			(6	)
Settlements		—			7			(11	)		(6	)		(10	)
Unrealized (loss)/gain		(1	)		—			(4	)		9			4
Realized gain/(loss)		1			—			6			(2	)		5

Ending balance as of December 31, 2011	$	27		$	9		$	64		$	65		$	165


	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	*(millions of dollars)*
	Equity			Fixed Income			Private Equity			Real Estate			Total Level 3
Beginning balance as of January 1, 2010	$	—		$	12		$	55		$	40		$	107
Transfer in (out) of Level 3		23			—			—			—			23
Purchases		4			3			8			16			31
Sales		(2	)		(3	)		—			—			(5	)
Settlements		1			(7	)		(3	)		(1	)		(10	)
Unrealized gain/(loss)		4			(3	)		(2	)		—			(1	)
Realized gain		—			1			4			—			5

Ending balance as of December 31, 2010	$	30		$	3		$	62		$	55		$	150


Years	Pension Benefits		Other Postretirement Benefits		Expected Medicare Part D Subsidies
	*(millions of dollars)*
2012	$	126	$	47	$	2
2013		125		49		2
2014		129		50		3
2015		133		52		3
2016		137		52		3
2017 through 2021	$	732	$	261	$	15

Pension Benefits [Member]


	Plan Assets at December 31,						Target Plan Asset Allocation
	2011			2010			2011			2010
Asset Category
Equity		36	%		53	%		38	%		60	%
Fixed Income		56	%		40	%		54	%		30	%
Other (real estate, private equity)		8	%		7	%		8	%		10	%

Total		100	%		100	%		100	%		100	%