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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
Sep. 30, 2015
Dec. 31, 2014
Trading securities    
Amortized cost of fixed maturities, trading $ 933,872 $ 1,180
Fixed maturities, trading at fair value 914,337 1,171
AFS securities    
Amortized cost of fixed maturities 32,207,019 27,728,771
Fixed maturities, at fair value 33,276,322 29,359,034
Non credit-related OTTI [1] (62,804) (76,720)
Amortized cost of short-term investments, available for sale 545,979 257,221
Short-term investments, at fair value 546,020 256,727
Cost of equity securities 984,192 763,833
Equity securities, at fair value 969,706 868,292
Available for sale securities, Cost or amortized cost 33,737,190 28,749,825
Available for sale securities, Gross unrealized gains 1,380,639 1,947,804
Available for sale securities, Gross unrealized losses (325,781) (213,576)
Total investments available for sale 34,792,048 30,484,053
Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 29,144,400 23,427,432
Gross unrealized gains on Fixed maturities 736,522 936,840
Gross unrealized losses on Fixed maturities (242,961) (186,803)
Fixed maturities, at fair value 29,637,961 24,177,469
Non credit-related OTTI [1] (62,804) (76,720)
Amortized cost of short-term investments, available for sale 545,979 257,221
Short term investments, gross unrealized gains 1,589 49
Short-term investments, gross unrealized losses (1,548) (543)
Short-term investments, at fair value 546,020 256,727
Cost of equity securities 984,192 763,833
Equity securities, gross unrealized gains 66,786 130,689
Equity securities, gross unrealized losses (81,272) (26,230)
Equity securities, at fair value 969,706 868,292
Available for sale securities, Cost or amortized cost 30,674,571 24,448,486
Available for sale securities, Gross unrealized gains 804,897 1,067,578
Available for sale securities, Gross unrealized losses (325,781) (213,576)
Total investments available for sale 31,153,687 25,302,488
Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 1,004,755 1,180
Fixed maturities, trading at fair value 985,223 1,171
AFS securities    
Amortized cost of fixed maturities 3,062,619 4,301,339
Gross unrealized gains on Fixed maturities 575,742 880,226
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 3,638,361 5,181,565
Non credit-related OTTI [1] 0 0
U.S. Government and Government - Related/Supported | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 4,241,444 2,100,851
Gross unrealized gains on Fixed maturities 72,193 77,889
Gross unrealized losses on Fixed maturities (14,914) (6,787)
Fixed maturities, at fair value 4,298,723 2,171,953
Non credit-related OTTI [1] 0 0
U.S. Government and Government - Related/Supported | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 4,614  
Fixed maturities, trading at fair value 4,610  
AFS securities    
Amortized cost of fixed maturities 10,998 14,866
Gross unrealized gains on Fixed maturities 2,414 3,858
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 13,412 18,724
Non credit-related OTTI [1] 0 0
RMBS - Agency | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 3,831,823 3,625,171
Gross unrealized gains on Fixed maturities 100,257 114,188
Gross unrealized losses on Fixed maturities (8,591) (10,783)
Fixed maturities, at fair value 3,923,489 3,728,576
Non credit-related OTTI [1] 0 0
RMBS - Agency | Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 652 3,301
Gross unrealized gains on Fixed maturities 162 481
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 814 3,782
Non credit-related OTTI [1] 0 0
RMBS - Non-Agency | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 351,793 404,398
Gross unrealized gains on Fixed maturities 27,528 41,108
Gross unrealized losses on Fixed maturities (16,356) (18,155)
Fixed maturities, at fair value 362,965 427,351
Non credit-related OTTI [1] (55,474) (67,918)
RMBS - Non-Agency | Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 25,341 71,075
Gross unrealized gains on Fixed maturities 3,492 14,260
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 28,833 85,335
Non credit-related OTTI [1] 0 0
Commercial mortgage-backed securities | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 837,416 1,033,819
Gross unrealized gains on Fixed maturities 17,642 23,987
Gross unrealized losses on Fixed maturities (4,974) (5,262)
Fixed maturities, at fair value 850,084 1,052,544
Non credit-related OTTI [1] (1,210) (2,033)
Commercial mortgage-backed securities | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 5,002  
Fixed maturities, trading at fair value 4,982  
AFS securities    
Amortized cost of fixed maturities 121,266 168,886
Gross unrealized gains on Fixed maturities 19,900 24,281
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 141,166 193,167
Non credit-related OTTI [1] 0 0
Collateralized debt obligations | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 419,019 717,544
Gross unrealized gains on Fixed maturities 1,486 1,659
Gross unrealized losses on Fixed maturities (10,342) (27,169)
Fixed maturities, at fair value 410,163 692,034
Non credit-related OTTI [1] (1,460) (1,663)
Other asset-backed securities | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 2,072,017 [2] 1,028,528 [3]
Gross unrealized gains on Fixed maturities 34,317 [2] 42,810 [3]
Gross unrealized losses on Fixed maturities (10,736) [2] (6,045) [3]
Fixed maturities, at fair value 2,095,598 [2] 1,065,293 [3]
Non credit-related OTTI [1] (1,351) [2] (1,797) [3]
Other asset-backed securities | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 20,119  
Fixed maturities, trading at fair value 19,872  
AFS securities    
Amortized cost of fixed maturities 141,774 238,168
Gross unrealized gains on Fixed maturities 21,097 35,373
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 162,871 273,541
Non credit-related OTTI [1] 0 0
US States and political subdivisions of the States | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 2,536,974 1,892,566
Gross unrealized gains on Fixed maturities 118,345 129,910
Gross unrealized losses on Fixed maturities (6,649) (1,204)
Fixed maturities, at fair value 2,648,670 2,021,272
Non credit-related OTTI [1] 0 0
Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 5,088,447 4,162,425
Gross unrealized gains on Fixed maturities 113,073 139,484
Gross unrealized losses on Fixed maturities (81,371) (61,836)
Fixed maturities, at fair value 5,120,149 4,240,073
Non credit-related OTTI [1] 0 0
Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 337,249  
Fixed maturities, trading at fair value 342,746  
AFS securities    
Amortized cost of fixed maturities 892,383 1,397,194
Gross unrealized gains on Fixed maturities 248,982 391,842
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 1,141,365 1,789,036
Non credit-related OTTI [1] 0 0
Financial Services Sector | Corporate | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 3,029,683 2,687,797
Gross unrealized gains on Fixed maturities 60,655 87,058
Gross unrealized losses on Fixed maturities (17,808) (12,939)
Fixed maturities, at fair value 3,072,530 2,761,916
Non credit-related OTTI [1] 0 0
Financial Services Sector | Corporate | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 228,026  
Fixed maturities, trading at fair value 219,767  
AFS securities    
Amortized cost of fixed maturities 596,259 701,587
Gross unrealized gains on Fixed maturities 73,529 99,432
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 669,788 801,019
Non credit-related OTTI [1] 0 0
Non-Financial Services Sector | Corporate | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 6,735,784 [2] 5,774,333 [3]
Gross unrealized gains on Fixed maturities 191,026 [2] 278,747 [3]
Gross unrealized losses on Fixed maturities (71,220) [2] (36,623) [3]
Fixed maturities, at fair value 6,855,590 [2] 6,016,457 [3]
Non credit-related OTTI [1] (3,309) [2] (3,309) [3]
Non-Financial Services Sector | Corporate | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 409,745 1,180
Fixed maturities, trading at fair value 393,246 1,171
AFS securities    
Amortized cost of fixed maturities 1,273,946 1,706,262
Gross unrealized gains on Fixed maturities 206,166 310,699
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 1,480,112 2,016,961
Non credit-related OTTI [1] $ 0 $ 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 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 $74.3 million and an amortized cost of $64.6 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 value of these notes.
[3] Included 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 $79.9 million and an amortized cost of $68.4 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 value of these notes.