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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2016
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)
2016
 
2015
 
2014
Net change in proceeds managed
 
 
 
 
 
Net change in fixed income securities
$
(584
)
 
$
—

 
$
—

Net change in short-term investments
295

 
(59
)
 
(167
)
Operating cash flow used
(289
)
 
(59
)
 
(167
)
Net change in cash
—

 
1

 
9

Net change in proceeds managed
$
(289
)

$
(58
)

$
(158
)
 
 
 
 
 
 
Net change in liabilities
 
 
 
 
 
Liabilities for collateral, beginning of year
$
(840
)
 
$
(782
)
 
$
(624
)
Liabilities for collateral, end of year
(1,129
)
 
(840
)
 
(782
)
Operating cash flow provided
$
289


$
58


$
158