Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingent Liabilities [Abstract]

Rent expense

	Years Ended
	December 31
	2011		2010		2009
	(in millions)
Office facilities	$	73	$	77	$	75
Equipment		10		9		13
	$	83	$	86	$	88

Future minimum rental payments required under non-cancellable operating leases

Years Ending December 31	(in millions)
2012	$	71
2013		62
2014		46
2015		33
2016		25
After 2016		49
	$	286