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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2013
Supplemental Cash Flow Information  
Schedule of supplemental cash flow information from collateralized securities received
($ in millions)
   2013   2012   2011  

Net change in proceeds managed

                    

Net change in short-term investments

   $ 190   $ (341 ) $ 21  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Operating cash flow provided (used)

     190     (341 )   21  

Net change in cash

     (6 )   (5 )   1  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net change in proceeds managed

  
$
184		  
$
(346
)
$
22		  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Net change in liabilities

                    

Liabilities for collateral, beginning of year

   $ (808 ) $ (462 ) $ (484 )

Liabilities for collateral, end of year

     (624 )   (808 )   (462 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Operating cash flow (used) provided

   $ (184 ) $ 346   $ (22 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​