Goodwill (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill [Abstract]

Schedule of Goodwill

	2011						2010
	Gross Amount		Accumulated Impairment Losses		Carrying Amount		Gross Amount		Accumulated Impairment Losses		Carrying Amount
	(millions of dollars)
Beginning balance as of January 1	$	1,425	$	18	$	1,407	$	1,425	$	18	$	1,407
Impairment losses		—		—		—		—		—		—
Ending balance as of December 31	$	1,425	$	18	$	1,407	$	1,425	$	18	$	1,407