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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnership interests and other investments, as well as mergers completed with equity securities, totaled $102 million, $306 million and $231 million in 2014, 2013 and 2012, respectively.
Liabilities for collateral received in conjunction with the Company’s securities lending program were $508 million, $322 million and $543 million as of December 31, 2014, 2013 and 2012, respectively, and are reported in other liabilities and accrued expenses.  Obligations to return cash collateral for over-the-counter (“OTC”) and cleared derivatives were $2 million, $6 million and $18 million as of December 31, 2014, 2013 and 2012, respectively, and are reported in other liabilities and accrued expenses or other investments.  The accompanying cash flows are included in cash flows from operating activities in the Consolidated Statements of Cash Flows along with the activities resulting from management of the proceeds, which for the years ended December 31 are as follows: 
($ in millions)
2014
 
2013
 
2012
Net change in proceeds managed
 
 
 
 
 
Net change in short-term investments
$
(182
)
 
$
235

 
$
(298
)
Operating cash flow (used) provided
(182
)
 
235

 
(298
)
Net change in cash
—

 
(2
)
 
—

Net change in proceeds managed
$
(182
)
 
$
233

 
$
(298
)
 
 
 
 
 
 
Net change in liabilities
 

 
 

 
 

Liabilities for collateral, beginning of year
$
(328
)
 
$
(561
)
 
$
(263
)
Liabilities for collateral, end of year
(510
)
 
(328
)
 
(561
)
Operating cash flow provided (used)
$
182

 
$
(233
)
 
$
298