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Investments - Cost (amortized cost for fixed maturities and short-term investments), fair value, gross unrealized gains, gross unrealized (losses), and OTTI recorded in AOCI (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
May 01, 2014
Dec. 31, 2013
AFS securities      
Cost or amortized cost of Fixed maturities $ 28,418,355   $ 27,111,874
Gross unrealized gains on Fixed maturities     807,684
Gross unrealized losses on Fixed maturities     (419,422)
Fixed maturities, at fair value 29,806,144   27,500,136
Gross Unrealized Losses Non-credit related OTTI (79,674)   (86,882) [1]
Short-term investments, amortized cost 284,898   455,470
Short-term investments, gross unrealized gains 96   962
Short-term investments, gross unrealized losses (3,107)   (144)
Short-term investments, at fair value 281,887   456,288
Cost of equity securities 848,171   903,201
Equity securities, gross unrealized gains 127,159   154,506
Equity securities, gross unrealized losses (14,962)   (17,470)
Equity securities, at fair value 960,368   1,040,237
Available for sale securities, Cost or amortized cost 29,551,424   28,470,545
Available for sale securities, Gross unrealized gains 1,694,685   963,152
Available for sale securities, Gross unrealized losses (197,710)   (437,036)
Total investments available for sale 31,048,399   28,996,661
Fixed maturities - HTM      
Fixed maturities, held to maturity 0   2,858,695
Fixed maturites held to maturity, gross unrealized gains 0 424,900 274,150
Fixed maturites held to maturity, gross unrealized losses 0 0 (1,610)
Fair value of held to maturity securities 0   3,131,235
U.S. Government and Government - Related/Supported
      
AFS securities      
Cost or amortized cost of Fixed maturities     2,484,193
Gross unrealized gains on Fixed maturities     51,701
Gross unrealized losses on Fixed maturities     (34,043)
Fixed maturities, at fair value     2,501,851
Gross Unrealized Losses Non-credit related OTTI     0 [1]
Fixed maturities - HTM      
Fixed maturities, held to maturity 0   10,993
Fixed maturites held to maturity, gross unrealized gains     629
Fixed maturites held to maturity, gross unrealized losses     0
Fair value of held to maturity securities     11,622
Corporate
      
AFS securities      
Cost or amortized cost of Fixed maturities     10,802,332
Gross unrealized gains on Fixed maturities     433,097 [2]
Gross unrealized losses on Fixed maturities     (109,599) [2]
Fixed maturities, at fair value     11,125,830
Gross Unrealized Losses Non-credit related OTTI     (4,758) [1],[2]
Fixed maturities - HTM      
Fixed maturities, held to maturity     1,386,863
Fixed maturites held to maturity, gross unrealized gains     113,179
Fixed maturites held to maturity, gross unrealized losses     (968)
Fair value of held to maturity securities     1,499,074
RMBS - Agency
      
AFS securities      
Cost or amortized cost of Fixed maturities     3,540,101
Gross unrealized gains on Fixed maturities     68,098
Gross unrealized losses on Fixed maturities     (62,077)
Fixed maturities, at fair value     3,546,122
Gross Unrealized Losses Non-credit related OTTI     0 [1]
RMBS - Non-Agency
      
AFS securities      
Cost or amortized cost of Fixed maturities     396,798
Gross unrealized gains on Fixed maturities     33,096
Gross unrealized losses on Fixed maturities     (31,126)
Fixed maturities, at fair value     398,768
Gross Unrealized Losses Non-credit related OTTI     (74,528) [1]
Fixed maturities - HTM      
Fixed maturities, held to maturity 0   66,987
Fixed maturites held to maturity, gross unrealized gains     4,985
Fixed maturites held to maturity, gross unrealized losses     0
Fair value of held to maturity securities     71,972
CMBS
      
AFS securities      
Cost or amortized cost of Fixed maturities     1,223,313
Gross unrealized gains on Fixed maturities     39,255
Gross unrealized losses on Fixed maturities     (15,773)
Fixed maturities, at fair value     1,246,795
Gross Unrealized Losses Non-credit related OTTI     (2,753) [1]
Fixed maturities - HTM      
Fixed maturities, held to maturity 0   144,924
Fixed maturites held to maturity, gross unrealized gains     11,864
Fixed maturites held to maturity, gross unrealized losses     0
Fair value of held to maturity securities     156,788
CDO
      
AFS securities      
Cost or amortized cost of Fixed maturities     754,414
Gross unrealized gains on Fixed maturities     5,833
Gross unrealized losses on Fixed maturities     (42,934)
Fixed maturities, at fair value     717,313
Gross Unrealized Losses Non-credit related OTTI     (2,036) [1]
Other asset-backed securities
      
AFS securities      
Cost or amortized cost of Fixed maturities     1,210,384
Gross unrealized gains on Fixed maturities     40,560
Gross unrealized losses on Fixed maturities     (8,840)
Fixed maturities, at fair value     1,242,104
Gross Unrealized Losses Non-credit related OTTI     (2,807) [1]
Fixed maturities - HTM      
Fixed maturities, held to maturity 0   106,540
Fixed maturites held to maturity, gross unrealized gains     6,908
Fixed maturites held to maturity, gross unrealized losses     0
Fair value of held to maturity securities     113,448
U.S. States and political subdivisions of the States
      
AFS securities      
Cost or amortized cost of Fixed maturities     1,821,499
Gross unrealized gains on Fixed maturities     55,083
Gross unrealized losses on Fixed maturities     (30,770)
Fixed maturities, at fair value     1,845,812
Gross Unrealized Losses Non-credit related OTTI     0 [1]
Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported
      
AFS securities      
Cost or amortized cost of Fixed maturities     4,878,840
Gross unrealized gains on Fixed maturities     80,961
Gross unrealized losses on Fixed maturities     (84,260)
Fixed maturities, at fair value     4,875,541
Gross Unrealized Losses Non-credit related OTTI     0 [1]
Fixed maturities - HTM      
Fixed maturities, held to maturity 0   1,142,388
Fixed maturites held to maturity, gross unrealized gains     136,585
Fixed maturites held to maturity, gross unrealized losses     (642)
Fair value of held to maturity securities     1,278,331
Excluding Life Funds Withheld Assets
      
AFS securities      
Cost or amortized cost of Fixed maturities 23,861,565    
Gross unrealized gains on Fixed maturities 861,135    
Gross unrealized losses on Fixed maturities (179,641)    
Fixed maturities, at fair value 24,543,059    
Gross Unrealized Losses Non-credit related OTTI (79,674) [1]    
Available for sale securities, Cost or amortized cost 24,994,634    
Available for sale securities, Gross unrealized gains 988,390    
Available for sale securities, Gross unrealized losses (197,710)    
Total investments available for sale 25,785,314    
Excluding Life Funds Withheld Assets | U.S. Government and Government - Related/Supported
      
AFS securities      
Cost or amortized cost of Fixed maturities 2,081,050    
Gross unrealized gains on Fixed maturities 58,757    
Gross unrealized losses on Fixed maturities (12,299)    
Fixed maturities, at fair value 2,127,508    
Gross Unrealized Losses Non-credit related OTTI 0 [1]    
Excluding Life Funds Withheld Assets | Corporate
      
AFS securities      
Cost or amortized cost of Fixed maturities 9,117,201    
Gross unrealized gains on Fixed maturities 356,438 [3]    
Gross unrealized losses on Fixed maturities (46,614) [3]    
Fixed maturities, at fair value 9,427,025    
Gross Unrealized Losses Non-credit related OTTI (4,746) [1],[3]    
Excluding Life Funds Withheld Assets | RMBS - Agency
      
AFS securities      
Cost or amortized cost of Fixed maturities 3,263,848    
Gross unrealized gains on Fixed maturities 92,763    
Gross unrealized losses on Fixed maturities (21,729)    
Fixed maturities, at fair value 3,334,882    
Gross Unrealized Losses Non-credit related OTTI 0 [1]    
Excluding Life Funds Withheld Assets | RMBS - Non-Agency
      
AFS securities      
Cost or amortized cost of Fixed maturities 412,443    
Gross unrealized gains on Fixed maturities 42,171    
Gross unrealized losses on Fixed maturities (18,960)    
Fixed maturities, at fair value 435,654    
Gross Unrealized Losses Non-credit related OTTI (69,195) [1]    
Excluding Life Funds Withheld Assets | CMBS
      
AFS securities      
Cost or amortized cost of Fixed maturities 1,081,102    
Gross unrealized gains on Fixed maturities 25,644    
Gross unrealized losses on Fixed maturities (7,493)    
Fixed maturities, at fair value 1,099,253    
Gross Unrealized Losses Non-credit related OTTI (2,139) [1]    
Excluding Life Funds Withheld Assets | CDO
      
AFS securities      
Cost or amortized cost of Fixed maturities 770,139    
Gross unrealized gains on Fixed maturities 2,835    
Gross unrealized losses on Fixed maturities (26,339)    
Fixed maturities, at fair value 746,635    
Gross Unrealized Losses Non-credit related OTTI (1,671) [1]    
Excluding Life Funds Withheld Assets | Other asset-backed securities
      
AFS securities      
Cost or amortized cost of Fixed maturities 1,116,326    
Gross unrealized gains on Fixed maturities 45,578    
Gross unrealized losses on Fixed maturities (4,439)    
Fixed maturities, at fair value 1,157,465    
Gross Unrealized Losses Non-credit related OTTI (1,923) [1]    
Excluding Life Funds Withheld Assets | U.S. States and political subdivisions of the States
      
AFS securities      
Cost or amortized cost of Fixed maturities 1,863,092    
Gross unrealized gains on Fixed maturities 121,194    
Gross unrealized losses on Fixed maturities (2,827)    
Fixed maturities, at fair value 1,981,459    
Gross Unrealized Losses Non-credit related OTTI 0 [1]    
Excluding Life Funds Withheld Assets | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported
      
AFS securities      
Cost or amortized cost of Fixed maturities 4,156,364    
Gross unrealized gains on Fixed maturities 115,755    
Gross unrealized losses on Fixed maturities (38,941)    
Fixed maturities, at fair value 4,233,178    
Gross Unrealized Losses Non-credit related OTTI 0 [1]    
Life Funds Withheld Assets
      
AFS securities      
Cost or amortized cost of Fixed maturities 4,556,790    
Gross unrealized gains on Fixed maturities 706,295    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 5,263,085   0
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | U.S. Government and Government - Related/Supported
      
AFS securities      
Cost or amortized cost of Fixed maturities 15,572    
Gross unrealized gains on Fixed maturities 2,754    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 18,326    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | Corporate
      
AFS securities      
Cost or amortized cost of Fixed maturities 2,564,060    
Gross unrealized gains on Fixed maturities 334,624    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 2,898,684    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | RMBS - Agency
      
AFS securities      
Cost or amortized cost of Fixed maturities 3,580    
Gross unrealized gains on Fixed maturities 316    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 3,896    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | RMBS - Non-Agency
      
AFS securities      
Cost or amortized cost of Fixed maturities 75,092    
Gross unrealized gains on Fixed maturities 11,450    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 86,542    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | CMBS
      
AFS securities      
Cost or amortized cost of Fixed maturities 180,432    
Gross unrealized gains on Fixed maturities 19,916    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 200,348    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | CDO
      
AFS securities      
Cost or amortized cost of Fixed maturities 0    
Gross unrealized gains on Fixed maturities 0    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 0    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | Other asset-backed securities
      
AFS securities      
Cost or amortized cost of Fixed maturities 251,324    
Gross unrealized gains on Fixed maturities 26,905    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 278,229    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | U.S. States and political subdivisions of the States
      
AFS securities      
Cost or amortized cost of Fixed maturities 0    
Gross unrealized gains on Fixed maturities 0    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 0    
Gross Unrealized Losses Non-credit related OTTI 0    
Life Funds Withheld Assets | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported
      
AFS securities      
Cost or amortized cost of Fixed maturities 1,466,730    
Gross unrealized gains on Fixed maturities 310,330    
Gross unrealized losses on Fixed maturities 0    
Fixed maturities, at fair value 1,777,060    
Gross Unrealized Losses Non-credit related OTTI $ 0    
[1] Represents the non-credit component of OTTI losses, adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the date an impairment was recorded.
[2] Included within Corporate are certain medium term notes supported primarily by pools of European investment grade credit with varying degrees of leverage. The notes have a fair value of $154.6 million and an amortized cost of $147.7 million. These notes allow the investor to participate in cash flows of the underlying bonds including certain residual values, which could serve to either decrease or increase the ultimate values of these notes.
[3] Included within Corporate are certain medium term notes supported primarily by pools of European investment grade credit with varying degrees of leverage. The notes have a fair value of $152.4 million and an amortized cost of $141.1 million. These notes allow the investor to participate in cash flows of the underlying bonds including certain residual values, which could serve to either decrease or increase the ultimate values of these notes.