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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
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale $ 31,444,747 $ 31,517,654 $ 27,728,771
Fixed maturities, at fair value 32,647,573 32,257,589 29,359,034
Non credit-related OTTI (55,423) [1] (57,734) [1],[2] (76,720) [2]
Amortized cost of short-term investments, available for sale 317,939 618,851 257,221
Short-term investments, at fair value 317,304 617,390 256,727
Cost of equity securities, available for sale 831,543 834,079 763,833
Equity securities, at fair value 878,407 878,919 868,292
Amortized cost 32,594,229 32,970,584 28,749,825
Gross unrealized gains 1,488,746 1,153,289 1,947,804
Gross unrealized losses (239,691) (369,975) (213,576)
Total investments available for sale 33,843,284 33,753,898 30,484,053
Excluding Life Funds Withheld Assets      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 29,016,396 28,839,622 23,427,432
Gross unrealized gains, fixed maturities 859,790 587,258 936,840
Gross unrealized losses, fixed maturities (191,970) (322,394) (186,803)
Fixed maturities, at fair value 29,684,216 29,104,486 24,177,469
Non credit-related OTTI (55,423) [1] (57,734) [1],[2] (76,720) [2]
Amortized cost of short-term investments, available for sale 317,939 618,851 257,221
Short term investments, gross unrealized gains 433 967 49
Short term investments, gross unrealized losses (1,068) (2,428) (543)
Short-term investments, at fair value 317,304 617,390 256,727
Cost of equity securities, available for sale 831,543 834,079 763,833
Equity securities, gross unrealized gains 93,517 89,993 130,689
Equity securities, gross unrealized losses (46,653) (45,153) (26,230)
Equity securities, at fair value 878,407 878,919 868,292
Amortized cost 30,165,878 30,292,552 24,448,486
Gross unrealized gains 953,740 678,218 1,067,578
Gross unrealized losses (239,691) (369,975) (213,576)
Total investments available for sale 30,879,927 30,600,795 25,302,488
Excluding Life Funds Withheld Assets | U.S. Government and Government - Related/Supported      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 4,483,796 5,047,621 2,100,851
Gross unrealized gains, fixed maturities 101,066 52,355 77,889
Gross unrealized losses, fixed maturities (7,875) (34,339) (6,787)
Fixed maturities, at fair value 4,576,987 5,065,637 2,171,953
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Excluding Life Funds Withheld Assets | RMBS - Agency      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 4,259,838 3,697,756 3,625,171
Gross unrealized gains, fixed maturities 112,260 77,776 114,188
Gross unrealized losses, fixed maturities (5,091) (17,561) (10,783)
Fixed maturities, at fair value 4,367,007 3,757,971 3,728,576
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Excluding Life Funds Withheld Assets | RMBS - Non-Agency      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 303,377 319,876 404,398
Gross unrealized gains, fixed maturities 20,313 25,644 41,108
Gross unrealized losses, fixed maturities (20,847) (16,980) (18,155)
Fixed maturities, at fair value 302,843 328,540 427,351
Non credit-related OTTI (52,025) [1] (54,200) [1],[2] (67,918) [2]
Excluding Life Funds Withheld Assets | Commercial mortgage-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 317,886 401,713 1,033,819
Gross unrealized gains, fixed maturities 10,324 7,933 23,987
Gross unrealized losses, fixed maturities (2,725) (4,330) (5,262)
Fixed maturities, at fair value 325,485 405,316 1,052,544
Non credit-related OTTI (1,163) [1] (1,182) [1],[2] (2,033) [2]
Excluding Life Funds Withheld Assets | Collateralized debt obligations      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 25,845 41,679 717,544
Gross unrealized gains, fixed maturities 2 4 1,659
Gross unrealized losses, fixed maturities (4,118) (9,273) (27,169)
Fixed maturities, at fair value 21,729 32,410 692,034
Non credit-related OTTI (1,208) [1] (1,208) [1],[2] (1,663) [2]
Excluding Life Funds Withheld Assets | Other asset-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 1,154,679 1,164,426 1,028,528
Gross unrealized gains, fixed maturities 19,123 17,665 42,810
Gross unrealized losses, fixed maturities (10,904) (13,519) (6,045)
Fixed maturities, at fair value 1,162,898 1,168,572 1,065,293
Non credit-related OTTI (1,027) [1] (1,144) [1],[2] (1,797) [2]
Excluding Life Funds Withheld Assets | US States and political subdivisions of the States      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 2,436,400 2,514,048 1,892,566
Gross unrealized gains, fixed maturities 149,140 125,395 129,910
Gross unrealized losses, fixed maturities (793) (7,373) (1,204)
Fixed maturities, at fair value 2,584,747 2,632,070 2,021,272
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Excluding Life Funds Withheld Assets | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 5,442,418 5,249,148 4,162,425
Gross unrealized gains, fixed maturities 161,392 100,383 139,484
Gross unrealized losses, fixed maturities (57,115) (97,917) (61,836)
Fixed maturities, at fair value 5,546,695 5,251,614 4,240,073
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 2,428,351 2,678,032 4,301,339
Gross unrealized gains, fixed maturities 535,006 475,071 880,226
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 2,963,357 3,153,103 5,181,565
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets | U.S. Government and Government - Related/Supported      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 10,315 10,721 14,866
Gross unrealized gains, fixed maturities 2,377 2,021 3,858
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 12,692 12,742 18,724
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets | RMBS - Agency      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 597 591 3,301
Gross unrealized gains, fixed maturities 136 161 481
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 733 752 3,782
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets | RMBS - Non-Agency      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 23,172 24,401 71,075
Gross unrealized gains, fixed maturities 2,657 2,552 14,260
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 25,829 26,953 85,335
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets | Commercial mortgage-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 92,586 107,968 168,886
Gross unrealized gains, fixed maturities 16,328 14,513 24,281
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 108,914 122,481 193,167
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets | Other asset-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 105,635 132,674 238,168
Gross unrealized gains, fixed maturities 16,086 17,121 35,373
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 121,721 149,795 273,541
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Life Funds Withheld Assets | Non-U.S. Sovereign Government, Provincial, Supranational, and Government-Related/Supported      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 650,259 737,735 1,397,194
Gross unrealized gains, fixed maturities 226,668 195,781 391,842
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 876,927 933,516 1,789,036
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Financial Services Sector | Excluding Life Funds Withheld Assets | Corporate      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 3,656,521 3,535,830 2,687,797
Gross unrealized gains, fixed maturities 75,341 49,535 87,058
Gross unrealized losses, fixed maturities (27,547) (23,456) (12,939)
Fixed maturities, at fair value 3,704,315 3,561,909 2,761,916
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Financial Services Sector | Life Funds Withheld Assets | Corporate      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 486,901 531,016 701,587
Gross unrealized gains, fixed maturities 60,378 67,220 99,432
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 547,279 598,236 801,019
Non credit-related OTTI 0 [1] 0 [1],[2] 0 [2]
Non-Financial Services Sector | Excluding Life Funds Withheld Assets | Corporate      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 6,935,636 6,867,525 5,774,333
Gross unrealized gains, fixed maturities 210,829 130,568 278,747
Gross unrealized losses, fixed maturities (54,955) (97,646) (36,623)
Fixed maturities, at fair value 7,091,510 6,900,447 6,016,457
Non credit-related OTTI 0 [1] 0 [1],[2] (3,309) [2]
Non-Financial Services Sector | Life Funds Withheld Assets | Corporate      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost of fixed maturities, available for sale 1,058,886 1,132,926 1,706,262
Gross unrealized gains, fixed maturities 210,376 175,702 310,699
Gross unrealized losses, fixed maturities 0 0 0
Fixed maturities, at fair value 1,269,262 1,308,628 2,016,961
Non credit-related OTTI $ 0 [1] $ 0 [1],[2] $ 0 [2]
[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 impairment measurement date.
[2] 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 impairment measurement date.