Pension And Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2012


At December 31,	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
	*(millions of dollars)*
Change in Benefit Obligation
Projected benefit obligation at beginning of year	$	2,124		$	1,970		$	750		$	704
Service cost		35			35			7			5
Interest cost		107			107			35			37
Amendments		—			18			—			7
Actuarial loss		341			176			24			36
Benefits paid (a)		(113	)		(182	)		(41	)		(40	)
Termination benefits		—			—			—			1

Projected benefit obligation at end of year	$	2,494		$	2,124		$	775		$	750

Change in Plan Assets
Fair value of plan assets at beginning of year	$	1,694		$	1,632		$	281		$	275
Actual return on plan assets		252			127			38			—
Company contributions		206			117			43			46
Benefits paid (a)		(113	)		(182	)		(41	)		(40	)

Fair value of plan assets at end of year	$	2,039		$	1,694		$	321		$	281

Funded Status at end of year (plan assets less plan obligations)	$	(455	)	$	(430	)	$	(454	)	$	(469	)

(a)	Other Postretirement Benefits paid is net of Medicare Part D subsidy receipts of $4 million and $2 million in 2012 and in 2011, respectively.


	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
	*(millions of dollars)*
Regulatory asset	$	934		$	794		$	237		$	243
Current liabilities		(6	)		(6	)		—			—
Pension benefit obligation		(449	)		(424	)		—			—
Other postretirement benefit obligations		—			—			(454	)		(469	)
Deferred income taxes, net		22			15			—			—
Accumulated other comprehensive loss, net of tax		32			24			—			—

Net amount recognized	$	533		$	403		$	(217	)	$	(226	)


	Pension Benefits				Other Postretirement Benefits
	2012		2011		2012			2011
	*(millions of dollars)*
Unrecognized net actuarial loss	$	979	$	822	$	238		$	247
Unamortized prior service cost (credit)		9		11		(1	)		(5	)
Unamortized transition liability		—		—		—			1

Total	$	988	$	833	$	237		$	243

Accumulated other comprehensive loss ($32 million and $24 million, net of tax, at December 31, 2012 and 2011, respectively)	$	54	$	39	$	—		$	—
Regulatory assets		934		794		237			243

Total	$	988	$	833	$	237		$	243


	Pension Benefits									Other Postretirement Benefits
	2012			2011			2010			2012			2011			2010
	*(millions of dollars)*
Service cost	$	35		$	35		$	35		$	7		$	5		$	5
Interest cost		107			107			110			35			37			39
Expected return on plan assets		(132	)		(128	)		(117	)		(18	)		(19	)		(16	)
Amortization of prior service cost		1			—			—			(4	)		(5	)		(5	)
Amortization of net actuarial loss		64			47			42			14			14			13
Recognition of benefit contract		—			—			—			—			—			—
Plan amendments		—			—			1			—			—			—
Termination benefits		—			—			3			1			1			6

Net periodic benefit cost	$	75		$	61		$	74		$	35		$	33		$	42


	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
Discount rate		4.15	%		5.00	%		4.10	%		4.90	%
Rate of compensation increase		5.00	%		5.00	%		5.00	%		5.00	%
Health care cost trend rate assumed for current year		—			—			8.00	%		8.00	%
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		—			—			2018			2017


	1-Percentage- Point Increase		1-Percentage- Point Decrease
Increase (decrease) in total service and interest cost	$	2	$	(1	)
Increase (decrease) in postretirement benefit obligation	$	33	$	(27	)


	Pension Benefits									Other Postretirement Benefits
	2012			2011			2010			2012			2011			2010
Discount rate		5.00	%		5.65	%		6.40	%		4.90	%		5.60	%		6.30	%
Expected long-term return on plan assets		7.25	%		7.75	%		8.00	%		7.25	%		7.75	%		8.00	%
Rate of compensation increase		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%


	Fair Value Measurements at December 31, 2012
	*(millions of dollars)*
Asset Category	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Pension Plan Assets:
Equity
Domestic (a)	$	367	$	169	$	170	$	28
International (b)		254		250		1		3
Fixed Income (c)		1,256		—		1,243		13
Other
Private Equity		56		—		—		56
Real Estate		74		—		—		74
Cash Equivalents (d)		32		32		—		—

Pension Plan Assets Subtotal		2,039		451		1,414		174

Other Postretirement Plan Assets:
Equity (e)		199		171		28		—
Fixed Income (f)		115		115		—		—
Cash Equivalents		7		7		—		—

Postretirement Plan Assets Subtotal		321		293		28		—

Total Pension and Other Postretirement Plan Assets	$	2,360	$	744	$	1,442	$	174

(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 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, 2011
	*(millions of dollars)*
Asset Category	Total		Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
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 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, 2012	$	27		$	9		$	64		$	65		$	165
Transfer in (out) of Level 3		—			2			—			—			2
Purchases		4			2			4			5			15
Sales		(4	)		(1	)		—			—			(5	)
Settlements		(1	)		1			(8	)		(5	)		(13	)
Unrealized gain/(loss)		4			—			(11	)		8			1
Realized gain		1			—			7			1			9

Ending balance as of December 31, 2012	$	31		$	13		$	56		$	74		$	174


	Fair Value Measurements 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


Years	Pension Benefits		Other Postretirement Benefits		Expected Medicare Part D Subsidies
	*(millions of dollars)*
2013	$	122	$	46	$	—
2014		127		47		—
2015		133		49		—
2016		137		49		—
2017		140		49		—
2018 through 2022	$	764	$	245	$	—

Pension Benefits [Member]


Asset Category	Plan Assets at December 31,						Target Plan Asset Allocation
Asset Category	2012			2011			2012			2011
Equity		30	%		36	%		32	%		38	%
Fixed Income		62	%		56	%		62	%		54	%
Other (real estate, private equity)		8	%		8	%		6	%		8	%

Total		100	%		100	%		100	%		100	%