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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2019
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 as follows:
 
 
For the years ended December 31,
($ in millions)
 
2019
 
2018
 
2017
Net change in proceeds managed
 
 
 
 
 
 
Net change in fixed income securities
 
$
80

 
$
234

 
$
259

Net change in short-term investments
 
(451
)
 
(568
)
 
(255
)
Operating cash flow (used) provided
 
(371
)
 
(334
)
 
4

Net change in cash
 
—

 
—

 
1

Net change in proceeds managed
 
$
(371
)

$
(334
)

$
5

 
 
 
 
 
 
 
Net change in liabilities
 
 
 
 
 
 
Liabilities for collateral, beginning of year
 
$
(1,458
)
 
$
(1,124
)
 
$
(1,129
)
Liabilities for collateral, end of year
 
(1,829
)
 
(1,458
)
 
(1,124
)
Operating cash flow provided (used)
 
$
371


$
334


$
(5
)