Commitments, Guarantees and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Commitments, Guarantees and Contingent Liabilities

Minimum rental commitments under noncancelable capital and operating leases

($ in millions)	Capital leases		Operating leases
2012	$	7	$	182
2013		8		138
2014		6		92
2015		2		66
2016		2		47
Thereafter		13		66
Total	$	38	$	591
Present value of minimum capital lease payments	$	29