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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 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 Condensed Consolidated Statements of Cash Flows along with the activities resulting from management of the proceeds, as follows:
($ in millions)
 
Nine months ended September 30,
 
2019
 
2018
Net change in proceeds managed
 
 

 
 

Net change in fixed income securities
 
$
80

 
$
175

Net change in short-term investments
 
(709
)
 
(454
)
Operating cash flow used
 
$
(629
)
 
$
(279
)
 
 
 
 
 
Net change in liabilities
 
 
 
 
Liabilities for collateral, beginning of period
 
$
(1,458
)
 
$
(1,124
)
Liabilities for collateral, end of period
 
(2,087
)
 
(1,403
)
Operating cash flow provided
 
$
629

 
$
279