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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
 
2014
 
2013
Net change in proceeds managed
 
 
 
 
 
Net change in short-term investments
$
(41
)
 
$
(182
)
 
$
235

Operating cash flow (used) provided
(41
)
 
(182
)
 
235

Net change in cash
1

 
—

 
(2
)
Net change in proceeds managed
$
(40
)
 
$
(182
)
 
$
233

 
 
 
 
 
 
Net change in liabilities
 

 
 

 
 

Liabilities for collateral, beginning of year
$
(510
)
 
$
(328
)
 
$
(561
)
Liabilities for collateral, end of year
(550
)
 
(510
)
 
(328
)
Operating cash flow provided (used)
$
40

 
$
182

 
$
(233
)