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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
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:
 
 
For the years ended December 31,
($ in millions)
 
2017
 
2016
 
2015
Net change in proceeds managed
 
 
 
 
 
 
Net change in fixed income securities
 
$
259

 
$
(584
)
 
$
—

Net change in short-term investments
 
(255
)
 
295

 
(59
)
Operating cash flow provided (used)
 
4

 
(289
)
 
(59
)
Net change in cash
 
1

 
—

 
1

Net change in proceeds managed
 
$
5


$
(289
)

$
(58
)
 
 
 
 
 
 
 
Cash flows from operating activities
Net change in liabilities
 
 
 
 
 
 
Liabilities for collateral, beginning of year
 
$
(1,129
)
 
$
(840
)
 
$
(782
)
Liabilities for collateral, end of year
 
(1,124
)
 
(1,129
)
 
(840
)
Operating cash flow (used) provided
 
$
(5
)

$
289


$
58