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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]  
Schedule of supplemental cash flow information from collateralized securities received
The accompanying cash flows are included in cash flows from operating activities in the Consolidated Statements of Cash Flows along with the activities resulting from management of the proceeds, which for the years ended December 31 are as follows: 
($ in millions)
2014
 
2013
 
2012
Net change in proceeds managed
 
 
 
 
 
Net change in short-term investments
$
(182
)
 
$
235

 
$
(298
)
Operating cash flow (used) provided
(182
)
 
235

 
(298
)
Net change in cash
—

 
(2
)
 
—

Net change in proceeds managed
$
(182
)
 
$
233

 
$
(298
)
 
 
 
 
 
 
Net change in liabilities
 

 
 

 
 

Liabilities for collateral, beginning of year
$
(328
)
 
$
(561
)
 
$
(263
)
Liabilities for collateral, end of year
(510
)
 
(328
)
 
(561
)
Operating cash flow provided (used)
$
182

 
$
(233
)
 
$
298