Available-for-sale securities (Tables)

12 Months Ended

Dec. 31, 2011

Available-for-sale securities

Schedule of available-for-sale securities

	December 31, 2011							December 31, 2010							December 31, 2009
(Millions of dollars)	CostBasis		UnrealizedPretax NetGains (Losses)			FairValue		Cost Basis		Unrealized Pretax Net Gains (Losses)			Fair Value		Cost Basis		Unrealized Pretax Net Gains (Losses)			Fair Value
Government debt
U.S. treasury bonds	$	10	$	—		$	10	$	12	$	—		$	12	$	14	$	—		$	14
Other U.S. and non-U.S. government bonds	90		2			92		76		1			77		65		—			65
Corporate bonds
Corporate bonds	542		30			572		481		30			511		455		20			475
Asset-backed securities	112		(1		)	111		136		—			136		141		(7		)	134
Mortgage-backed debt securities
U.S. governmental agency mortgage-backed securities	297		13			310		258		15			273		295		13			308
Residential mortgage-backed securities	33		(3		)	30		43		(3		)	40		61		(10		)	51
Commercial mortgage-backed securities	142		3			145		164		4			168		175		(13		)	162
Equity securities
Large capitalization value	127		21			148		100		22			122		76		13			89
Smaller company growth	22		7			29		23		8			31		19		5			24
Total	$	1,375	$	72		$	1,447	$	1,293	$	77		$	1,370	$	1,301	$	21		$	1,322

Investments in an unrealized loss position that are not other-than-temporarily impaired:

	December 31, 2011
	Less than 12 months 1				12 months or more 1				Total
(Millions of dollars)	FairValue		UnrealizedLosses		FairValue		UnrealizedLosses		FairValue		UnrealizedLosses
Corporate bonds
Corporate bonds	$	54	$	1	$	1	$	—	$	55	$	1
Asset-backed securities	1		—		20		5		21		5
Mortgage-backed debt securities
U.S. governmental agency mortgage-backed securities	51		1		—		—		51		1
Residential mortgage-backed securities	3		—		18		3		21		3
Commercial mortgage-backed securities	15		—		8		1		23		1
Equity securities
Large capitalization value	36		5		6		1		42		6
Smaller company growth	4		1		—		—		4		1
Total	$	164	$	8	$	53	$	10	$	217	$	18

1 Indicates length of time that individual securities have been in a continuous unrealized loss position.

Investments in an unrealized loss position that are not other-than-temporarily impaired:

	December 31, 2010
	Less than 12 months 1				12 months or more 1				Total
(Millions of dollars)	FairValue		UnrealizedLosses		FairValue		UnrealizedLosses		FairValue		UnrealizedLosses
Corporate bonds
Asset-backed securities	$	19	$	—	$	19	$	4	$	38	$	4
Mortgage-backed debt securities
Residential mortgage-backed securities	2		—		25		4		27		4
Commercial mortgage-backed securities	3		—		14		1		17		1
Equity securities
Large capitalization value	14		1		12		2		26		3
Total	$	38	$	1	$	70	$	11	$	108	$	12

1  Indicates length of time that individual securities have been in a continuous unrealized loss position.

Investments in an unrealized loss position that are not other-than-temporarily impaired:

	December 31, 2009
	Less than 12 months 1				12 months or more 1				Total
(Millions of dollars)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate bonds
Corporate bonds	$	25	$	—	$	10	$	1	$	35	$	1
Asset-backed securities	4		1		44		10		48		11
Mortgage-backed debt securities
Residential mortgage-backed securities	—		—		49		10		49		10
Commercial mortgage-backed securities	24		—		73		14		97		14
Equity securities
Large capitalization value	2		—		23		3		25		3
Total	$	55	$	1	$	199	$	38	$	254	$	39

1  Indicates length of time that individual securities have been in a continuous unrealized loss position.

Fair value of the available-for-sale debt securities, by contractual maturity

(Millions of dollars)	Cost Basis		Fair Value
Due in one year or less	$	69	$	70
Due after one year through five years	479		493
Due after five years through ten years	152		171
Due after ten years	54		51
U.S. agency mortgage-backed securities	297		310
Residential mortgage-backed securities	33		30
Commercial mortgage-backed securities	142		145
Total debt securities — available-for-sale	$	1,226	$	1,270

Schedule of proceeds and gross gain and losses from the sale of available-for-sale securities

	Years Ended December 31,
(Millions of dollars)	2011		2010		2009
Proceeds from the sale of available-for-sale securities	$	247	$	228	$	291
Gross gains from the sale of available-for-sale securities	$	4	$	10	$	9
Gross losses from the sale of available-for-sale securities	$	1	$	1	$	10