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Reinsurance (Details 2)
6 Months Ended 7 Months Ended 12 Months Ended 24 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
contract
layer
Dec. 31, 2015
USD ($)
contract
hurricane
limit
state
reinstatement
May. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   $ 8,518,000,000 $ 8,518,000,000 $ 8,518,000,000   $ 8,490,000,000      
Catastrophe Reinsurance Coverage Amount     4,420,000,000            
Accumulated deficit   39,413,000,000 39,413,000,000 39,413,000,000   37,842,000,000      
Ceded premium earned       1,338,000,000   1,446,000,000 $ 1,708,000,000    
Limit of aggregate losses under aggregate excess agreement     3,070,000,000 $ 400,000,000          
Catastrophe Insurance, Quota Share Basis, Percentage       100.00%          
Catastrophe Reinsurance Aggregate Loss Limit       $ 400,000,000          
Retention amount for catastrophe reinsurance agreement contracts     $ 500,000,000            
Number of Hurricanes | hurricane       2          
Excess Catastrophe Reinsurance Agreement Buffer Layer                  
Reinsurance recoverable                  
Contracts number | contract     2            
Excess Catastrophe Reinsurance Agreement Seventh Buffer Layer [Domain]                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     34.00%            
Limit of aggregate losses under aggregate excess agreement     $ 20,000,000            
Catastrophe Reinsurance Aggregate Annual Loss Limit     60,000,000            
Retention amount for catastrophe reinsurance agreement contracts     $ 3,510,000,000            
Excess Catastrophe Reinsurance Agreement Eight Buffer Layer [Member]                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     95.00%            
Limit of aggregate losses under aggregate excess agreement     $ 50,000,000            
Retention amount for catastrophe reinsurance agreement contracts     3,570,000,000            
Michigan Catastrophic Claim Association                  
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   4,660,000,000 4,660,000,000 $ 4,660,000,000   4,420,000,000      
Retention level per claim   $ 545,000           $ 530,000  
Reduction in accumulated deficit $ 50,640,000,000                
Accumulated deficit $ 691,000,000             $ 691,000,000  
Term of catastrophe reinsurance agreement contract   2 years              
Florida Hurricane Catastrophe Fund                  
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   $ 0 0 0          
Ceded premium earned       13,000,000   11,000,000 16,000,000    
Ceded losses incurred           0 0    
Percent of losses in excess of retention level to be reimbursed         90.00%        
Retention level for losses related to 2 largest hurricanes         $ 63,000,000        
Retention level for losses related to other hurricanes         21,000,000        
Maximum Retention level for losses related to hurricanes         $ 199,000,000        
National Flood Insurance Program                  
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   27,000,000 27,000,000 27,000,000   7,000,000      
Ceded premium earned       293,000,000   312,000,000 316,000,000    
Ceded losses incurred       120,000,000   38,000,000 289,000,000    
Catastrophe reinsurance                  
Reinsurance recoverable                  
Ceded losses incurred       $ 0          
Contracts number | contract       4          
New Jersey Excess Catastrophe Reinsurance agreement                  
Reinsurance recoverable                  
Contracts number | contract       3          
New Jersey agreement, contract one                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       32.00%          
Number of reinstatements each year for each contract | reinstatement       1          
Retention amount for catastrophe reinsurance agreement contracts       $ 165,000,000          
New Jersey agreement, contract two                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       32.00%          
Number of reinstatements each year for each contract | reinstatement       1          
Retention amount for catastrophe reinsurance agreement contracts       $ 157,000,000          
New Jersey agreement, contract three                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       32.00%          
Number of reinstatements each year for each contract | reinstatement       1          
Retention amount for catastrophe reinsurance agreement contracts       $ 150,000,000          
Kentucky agreement subject to three limits                  
Reinsurance recoverable                  
Limit of aggregate losses under aggregate excess agreement       25,000,000          
Retention amount for catastrophe reinsurance agreement contracts       $ 5,000,000          
Number of limits | limit       3          
Kentucky agreement subject to two limits                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       95.00%          
Contracts number | contract       1          
Number of limits | limit       2          
E&S Earthquake Agreement [Member]                  
Reinsurance recoverable                  
Contracts number | contract       1          
Term of catastrophe reinsurance agreement contract       3 years          
Pennsylvania Excess Catastrophe Reinsurance agreement                  
Reinsurance recoverable                  
Term of catastrophe reinsurance agreement contract       3 years          
Pennsylvania agreement subject to three limits                  
Reinsurance recoverable                  
Number of limits | limit       3          
Pennsylvania agreement subject to two limits                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       95.00%          
Limit of aggregate losses under aggregate excess agreement       $ 100,000,000          
Contracts number | contract       1          
Retention amount for catastrophe reinsurance agreement contracts       $ 100,000,000          
Number of limits | limit       2          
Castle Key Insurance Company and its subsidiaries agreements                  
Reinsurance recoverable                  
Number of separate catastrophe reinsurance agreements coordinating coverage for excess losses for Castle Key | contract       4          
Catastrophe Reinsurance Ninth Layer [Member]                  
Reinsurance recoverable                  
Limit of aggregate losses under aggregate excess agreement       $ 131,000,000          
Catastrophe Reinsurance Aggregate, Loss Limit Per Contract Year, Percent       29.00%          
Catastrophe Reinsurance Aggregate Annual Loss Limit     $ 446,000,000            
Retention amount for catastrophe reinsurance agreement contracts       $ 3,620,000,000          
Catastrophe reinsurance, first five layers                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       31.70%          
Catastrophe reinsurance, first coverage limit of fifth layer                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       95.00%          
Catastrophe reinsurance, sixth layer                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit       95.00%          
Contracts number | contract       2          
PCS excess catastrophe reinsurance agreement                  
Reinsurance recoverable                  
Number of states covered by reinsurance agreement | state       28          
PCS Class B excess catastrophe reinsurance agreement                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     34.00%            
Limit of aggregate losses under aggregate excess agreement           150,000,000      
Catastrophe Reinsurance Aggregate Annual Loss Limit     $ 440,000,000            
Retention amount for catastrophe reinsurance agreement contracts           3,070,000,000      
PCS Class A excess catastrophe reinsurance agreement                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     45.00%            
Limit of aggregate losses under aggregate excess agreement           200,000,000      
Catastrophe Reinsurance Aggregate Annual Loss Limit     $ 446,000,000            
Retention amount for catastrophe reinsurance agreement contracts           3,620,000,000      
Florida Excess Catastrophe Reinsurance agreement                  
Reinsurance recoverable                  
Ceded premium earned       $ 414,000,000   437,000,000 471,000,000    
Percent of losses in excess of retention level to be reimbursed       5.00%          
Limit of aggregate losses under aggregate excess agreement       $ 163,000,000          
Catastrophe Reinsurance Aggregate, Loss Limit Per Contract Year, Percent       90.00%          
Contracts number | contract       6          
Term of catastrophe reinsurance agreement contract one       3 years          
Catastrophe Reinsurance Loss Amount       $ 181,000,000          
Retention amount for catastrophe reinsurance agreement contracts       $ 66,000,000          
Term of catastrophe reinsurance agreement       1 year          
Florida Excess Catastrophe Reinsurance Agreement, Two Largest Hurricanes [Member]                  
Reinsurance recoverable                  
Limit of aggregate losses under aggregate excess agreement       $ 66,000,000          
Retention amount for catastrophe reinsurance agreement contracts       22,000,000          
Florida Excess Catastrophe Reinsurance Agreement, Provisional [Member]                  
Reinsurance recoverable                  
Limit of aggregate losses under aggregate excess agreement       707,000,000          
Retention amount for catastrophe reinsurance agreement contracts       15,000,000          
Catastrophe Reinsurance First Four Layers [Member]                  
Reinsurance recoverable                  
Number of layers subject to reinstatement in which catastrophe reinsurance agreement contracts are placed | layer     3            
Lloyd's of London                  
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   183,000,000 $ 183,000,000 183,000,000   202,000,000      
New Jersey Unsatisfied Claim and Judgment Fund                  
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   500,000,000 $ 500,000,000 500,000,000   508,000,000      
Minimum medical benefits portion of personal injury protection coverage for reimbursement to insurers for policies issued or renewed prior to January 1, 1991       75,000          
Minimum medical benefits portion of personal injury protection coverage for reimbursement to insurers for policies issued or renewed from January 1, 1991 to December 31, 2004       75,000          
Maximum reimbursement to insurers for medical benefits paid under personal injury protection coverage.       $ 250,000          
2014-1 PCS                  
Reinsurance recoverable                  
Contracts number | contract       3          
Number of states covered by reinsurance agreement | state       29          
PCS Class D excess catastrophe reinsurance agreement with a portion of seventh layer                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     61.00%            
Limit of aggregate losses under aggregate excess agreement       $ 305,000,000          
Catastrophe Reinsurance Aggregate Annual Loss Limit     $ 500,000,000            
Retention amount for catastrophe reinsurance agreement contracts       3,070,000,000          
PCS Class C excess catastrophe reinsurance agreement with a portion of ninth layer                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     26.00%            
Limit of aggregate losses under aggregate excess agreement       115,000,000          
Catastrophe Reinsurance Aggregate Annual Loss Limit     $ 446,000,000            
Retention amount for catastrophe reinsurance agreement contracts       3,620,000,000          
PCS Class B excess catastrophe reinsurance agreement with a portion of tenth layer                  
Reinsurance recoverable                  
Retention percentage of reinsurance limit     95.00%            
Limit of aggregate losses under aggregate excess agreement       330,000,000          
Catastrophe Reinsurance Aggregate Annual Loss Limit     $ 347,000,000            
Retention amount for catastrophe reinsurance agreement contracts       4,070,000,000          
Property-Liability                  
Reinsurance recoverable                  
Total amounts recoverable from reinsurers, industry pools or facilities   5,980,000,000 5,980,000,000 5,980,000,000   5,780,000,000      
Reinsurance recoverables related to losses paid by the Company and billed to reinsurers   86,000,000 86,000,000 86,000,000   89,000,000      
Reinsurance recoverables related to ceded unpaid losses   5,892,000,000 5,892,000,000 5,892,000,000   5,694,000,000 $ 4,664,000,000   $ 4,010,000,000
Maximum amount due from any single reinsurer not separately disclosed       32,000,000   34,000,000      
Property-Liability | Westport Insurance Corporation                  
Reinsurance recoverable                  
Largest reinsurance recoverable from a single reinsurer       62,000,000   65,000,000      
Discontinued Lines and Coverages                  
Reinsurance recoverable                  
Allowance for uncollectible reinsurance   $ 80,000,000 $ 80,000,000 $ 80,000,000   $ 95,000,000