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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 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 Condensed Consolidated Statements of Cash Flows along with the activities resulting from management of the proceeds, which are as follows:
($ in millions)
Nine months ended September 30,
 
2017
 
2016
Net change in proceeds managed
 

 
 

Net change in fixed income securities
$
129

 
$
(436
)
Net change in short-term investments
(157
)
 
181

Operating cash flow used
(28
)
 
(255
)
Net change in cash
1

 
—

Net change in proceeds managed
$
(27
)
 
$
(255
)
 
 
 
 
Net change in liabilities
 

 
 

Liabilities for collateral, beginning of period
$
(1,129
)
 
$
(840
)
Liabilities for collateral, end of period
(1,156
)
 
(1,095
)
Operating cash flow provided
$
27

 
$
255