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Investments and Derivative Instruments (Details 10) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Variable Interest Entities Primary Beneficiary    
Total Assets $ 188 $ 199
Total Liabilities 20 33
Maximum Exposure to Loss 178 177
Collateralized Debt Obligations [Member]
   
Variable Interest Entities Primary Beneficiary    
Total Assets 18 31
Collateralized Debt Obligations [Member] | Consolidated VIEs [Member]
   
Variable Interest Entities Primary Beneficiary    
Total Assets 18 31
Total Liabilities 20 33
Maximum Exposure to Loss 0 0
Investment Fund [Member] | Consolidated VIEs [Member]
   
Variable Interest Entities Primary Beneficiary    
Total Assets 167 164
Total Liabilities 0 0
Maximum Exposure to Loss 175 173
Limited partnerships [Member]
   
Variable Interest Entities Primary Beneficiary    
Variable Interest Entity Assets Included in Limited Partnerships and Other Alternative Investments 3 4
Limited partnerships [Member] | Consolidated VIEs [Member]
   
Variable Interest Entities Primary Beneficiary    
Total Liabilities 0 0
Maximum Exposure to Loss $ 3 $ 4