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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
Jun. 30, 2015
Dec. 31, 2014
Trading securities    
Amortized cost of fixed maturities, trading $ 768,492 $ 1,180
Fixed maturities, trading at fair value 748,931 1,171
AFS securities    
Amortized cost of fixed maturities 32,699,709 27,728,771
Fixed maturities, at fair value 33,767,991 29,359,034
Non credit-related OTTI [1] (65,122) (76,720)
Amortized cost of short-term investments, available for sale 806,990 257,221
Short-term investments, at fair value 807,486 256,727
Cost of equity securities 964,038 763,833
Equity securities, at fair value 1,073,470 868,292
Available for sale securities, Cost or amortized cost 34,470,737 28,749,825
Available for sale securities, Gross unrealized gains 1,460,961 1,947,804
Available for sale securities, Gross unrealized losses (282,751) (213,576)
Total investments available for sale 35,648,947 30,484,053
Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 29,310,791 23,427,432
Gross unrealized gains on Fixed maturities 715,382 936,840
Gross unrealized losses on Fixed maturities (255,270) (186,803)
Fixed maturities, at fair value 29,770,903 24,177,469
Non credit-related OTTI [1] (65,122) (76,720)
Amortized cost of short-term investments, available for sale 806,990 257,221
Short term investments, gross unrealized gains 1,190 49
Short-term investments, gross unrealized losses (694) (543)
Short-term investments, at fair value 807,486 256,727
Cost of equity securities 964,038 763,833
Equity securities, gross unrealized gains 136,219 130,689
Equity securities, gross unrealized losses (26,787) (26,230)
Equity securities, at fair value 1,073,470 868,292
Available for sale securities, Cost or amortized cost 31,081,819 24,448,486
Available for sale securities, Gross unrealized gains 852,791 1,067,578
Available for sale securities, Gross unrealized losses (282,751) (213,576)
Total investments available for sale 31,651,859 25,302,488
Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 811,049 1,180
Fixed maturities, trading at fair value 791,484 1,171
AFS securities    
Amortized cost of fixed maturities 3,388,918 4,301,339
Gross unrealized gains on Fixed maturities 608,170 880,226
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 3,997,088 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 3,786,878 2,100,851
Gross unrealized gains on Fixed maturities 56,994 77,889
Gross unrealized losses on Fixed maturities (16,766) (6,787)
Fixed maturities, at fair value 3,827,106 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 3,628  
Fixed maturities, trading at fair value 3,596  
AFS securities    
Amortized cost of fixed maturities 11,501 14,866
Gross unrealized gains on Fixed maturities 2,177 3,858
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 13,678 18,724
Non credit-related OTTI [1] 0 0
RMBS - Agency | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 3,890,265 3,625,171
Gross unrealized gains on Fixed maturities 88,699 114,188
Gross unrealized losses on Fixed maturities (20,820) (10,783)
Fixed maturities, at fair value 3,958,144 3,728,576
Non credit-related OTTI [1] 0 0
RMBS - Agency | Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 674 3,301
Gross unrealized gains on Fixed maturities 163 481
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 837 3,782
Non credit-related OTTI [1] 0 0
RMBS - Non-Agency | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 361,661 404,398
Gross unrealized gains on Fixed maturities 28,531 41,108
Gross unrealized losses on Fixed maturities (17,921) (18,155)
Fixed maturities, at fair value 372,271 427,351
Non credit-related OTTI [1] (57,074) (67,918)
RMBS - Non-Agency | Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 26,377 71,075
Gross unrealized gains on Fixed maturities 3,214 14,260
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 29,591 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 929,466 1,033,819
Gross unrealized gains on Fixed maturities 14,903 23,987
Gross unrealized losses on Fixed maturities (8,311) (5,262)
Fixed maturities, at fair value 936,058 1,052,544
Non credit-related OTTI [1] (1,598) (2,033)
Commercial mortgage-backed securities | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 262  
Fixed maturities, trading at fair value 261  
AFS securities    
Amortized cost of fixed maturities 126,539 168,886
Gross unrealized gains on Fixed maturities 19,078 24,281
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 145,617 193,167
Non credit-related OTTI [1] 0 0
Collateralized debt obligations | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 505,865 717,544
Gross unrealized gains on Fixed maturities 6,733 1,659
Gross unrealized losses on Fixed maturities (24,573) (27,169)
Fixed maturities, at fair value 488,025 692,034
Non credit-related OTTI [1] (1,625) (1,663)
Other asset-backed securities | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 2,326,633 [2] 1,028,528 [3]
Gross unrealized gains on Fixed maturities 35,669 [2] 42,810 [3]
Gross unrealized losses on Fixed maturities (11,915) [2] (6,045) [3]
Fixed maturities, at fair value 2,350,387 [2] 1,065,293 [3]
Non credit-related OTTI [1] (1,516) [2] (1,797) [3]
Other asset-backed securities | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 15,016  
Fixed maturities, trading at fair value 14,823  
AFS securities    
Amortized cost of fixed maturities 164,779 238,168
Gross unrealized gains on Fixed maturities 22,758 35,373
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 187,537 273,541
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 2,301,628 1,892,566
Gross unrealized gains on Fixed maturities 101,435 129,910
Gross unrealized losses on Fixed maturities (11,790) (1,204)
Fixed maturities, at fair value 2,391,273 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 5,220,879 4,162,425
Gross unrealized gains on Fixed maturities 111,046 139,484
Gross unrealized losses on Fixed maturities (71,863) (61,836)
Fixed maturities, at fair value 5,260,062 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 254,100  
Fixed maturities, trading at fair value 252,981  
AFS securities    
Amortized cost of fixed maturities 980,215 1,397,194
Gross unrealized gains on Fixed maturities 251,013 391,842
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 1,231,228 1,789,036
Non credit-related OTTI [1] 0 0
Financial Services Sector [Member] | Corporate | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 3,194,676 2,687,797
Gross unrealized gains on Fixed maturities 61,404 87,058
Gross unrealized losses on Fixed maturities (20,567) (12,939)
Fixed maturities, at fair value 3,235,513 2,761,916
Non credit-related OTTI [1] 0 0
Financial Services Sector [Member] | Corporate | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 194,385  
Fixed maturities, trading at fair value 187,169  
AFS securities    
Amortized cost of fixed maturities 639,699 701,587
Gross unrealized gains on Fixed maturities 83,223 99,432
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 722,922 801,019
Non credit-related OTTI [1] 0 0
Non-Financial Services Sector [Member] | Corporate | Excluding Life Funds Withheld Assets    
AFS securities    
Amortized cost of fixed maturities 6,792,840 [2] 5,774,333 [3]
Gross unrealized gains on Fixed maturities 209,968 [2] 278,747 [3]
Gross unrealized losses on Fixed maturities (50,744) [2] (36,623) [3]
Fixed maturities, at fair value 6,952,064 [2] 6,016,457 [3]
Non credit-related OTTI [1] (3,309) [2] (3,309) [3]
Non-Financial Services Sector [Member] | Corporate | Life Funds Withheld Assets    
Trading securities    
Amortized cost of fixed maturities, trading 343,658 1,180
Fixed maturities, trading at fair value 332,654 1,171
AFS securities    
Amortized cost of fixed maturities 1,439,134 1,706,262
Gross unrealized gains on Fixed maturities 226,544 310,699
Gross unrealized losses on Fixed maturities 0 0
Fixed maturities, at fair value 1,665,678 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 $75.3 million and an amortized cost of $64.5 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.