Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2011

Supplemental Cash Flow Information

Schedule of supplemental cash flow information from collateralized securities received

($ in millions)	2011			2010			2009
Net change in proceeds managed
Net change in short-term investments	$	21		$	171		$	(316	)
Operating cash flow provided (used)		21			171			(316	)
Net change in cash		1			3			(2	)
Net change in proceeds managed	$	22		$	174		$	(318	)
Net change in liabilities
Liabilities for collateral, beginning of year	$	(484	)	$	(658	)	$	(340	)
Liabilities for collateral, end of year		(462	)		(484	)		(658	)
Operating cash flow (used) provided	$	(22	)	$	(174	)	$	318