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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2016
Net change in proceeds managed
 
 
 
 
 
Net change in fixed income securities
$
94

 
$
149

 
$
(277
)
Net change in short-term investments
(77
)
 
(142
)
 
277

Operating cash flow provided
17

 
7

 
—

Net change in cash
—

 
1

 
—

Net change in proceeds managed
$
17

 
$
8

 
$
—

 
 
 
 
 
 
Net change in liabilities
 

 
 

 
 

Liabilities for collateral, beginning of year
$
(542
)
 
$
(550
)
 
$
(550
)
Liabilities for collateral, end of year
(525
)
 
(542
)
 
(550
)
Operating cash flow (used) provided
$
(17
)
 
$
(8
)
 
$
—