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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 2016
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)
Three months ended March 31,
 
2016
 
2015
Net change in proceeds managed
 

 
 

Net change in short-term investments
$
(34
)
 
$
27

Operating cash flow (used) provided
(34
)
 
27

Net change in cash
—

 
—

Net change in proceeds managed
$
(34
)
 
$
27

 
 
 
 
Net change in liabilities
 

 
 

Liabilities for collateral, beginning of period
$
(840
)
 
$
(782
)
Liabilities for collateral, end of period
(874
)
 
(755
)
Operating cash flow provided (used)
$
34

 
$
(27
)