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Investments (Details 1) (Insurance and Financial Services [Member], USD $)
In Thousands, unless otherwise specified
Jul. 01, 2012
Sep. 30, 2011
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis $ 14,616,687 $ 15,236,307
Available-for-sale Securities, Gross Unrealized Gains 788,364 653,005
Available-for-sale Securities, Gross Unrealized Losses (92,835) (234,795)
Available-for-sale Securities, Fair Value and Carrying Value 15,312,216 15,654,517
Derivative investments, Amortized Cost 145,871 171,612
Derivative investments, Gross Unrealized Gains 39,027 405
Derivative investments, Gross Unrealized Losses (24,333) (119,682)
Derivative investments, Fair Value and Carrying Value 160,565 52,335 [1]
Asset-backed loans and other invested assets, Amortized Cost 92,424 44,279
Asset-backed loans and other invested assets 92,424 44,279 [1]
Total investments, Amortized Cost 14,854,982 15,452,198
Total investment, Gross Unrealized Gains 827,391 653,410
Total investment, Gross Unrealized Losses (117,168) (354,477)
Total investments 15,565,205 15,751,131 [1]
U.S. Government [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 127,943 175,054
Available-for-sale Securities, Gross Unrealized Gains 11,213 8,270
Available-for-sale Securities, Fair Value and Carrying Value 139,156 183,324
Asset-backed securities [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 821,203 501,469
Available-for-sale Securities, Gross Unrealized Gains 6,112 1,785
Available-for-sale Securities, Gross Unrealized Losses (4,629) (2,770)
Available-for-sale Securities, Fair Value and Carrying Value 822,686 500,484
Commercial mortgage-backed securities [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 520,806 580,313
Available-for-sale Securities, Gross Unrealized Gains 24,185 3,427
Available-for-sale Securities, Gross Unrealized Losses (6,468) (18,163)
Available-for-sale Securities, Fair Value and Carrying Value 538,523 565,577
Corporates [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 10,442,653 11,479,862
Available-for-sale Securities, Gross Unrealized Gains 576,410 506,264
Available-for-sale Securities, Gross Unrealized Losses (40,285) (130,352)
Available-for-sale Securities, Fair Value and Carrying Value 10,978,778 11,855,774
Equities [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 237,440 292,112
Available-for-sale Securities, Gross Unrealized Gains 7,362 3,964
Available-for-sale Securities, Gross Unrealized Losses (2,538) (9,033)
Available-for-sale Securities, Fair Value and Carrying Value 242,264 287,043
Hybrids [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 632,001 699,915
Available-for-sale Securities, Gross Unrealized Gains 17,189 10,429
Available-for-sale Securities, Gross Unrealized Losses (22,334) (51,055)
Available-for-sale Securities, Fair Value and Carrying Value 626,856 659,289
Municipals [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 1,110,090 824,562
Available-for-sale Securities, Gross Unrealized Gains 137,054 111,929
Available-for-sale Securities, Gross Unrealized Losses (1,044) (7)
Available-for-sale Securities, Fair Value and Carrying Value 1,246,100 936,484
Agency residential mortgage-backed securities [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 163,855 217,354
Available-for-sale Securities, Gross Unrealized Gains 4,662 4,966
Available-for-sale Securities, Gross Unrealized Losses (491) (295)
Available-for-sale Securities, Fair Value and Carrying Value 168,026 222,025
Non-agency residential mortgage-backed securities [Member]
   
Available-for-sale securities    
Available-for-sale Securities, Amortized Cost Basis 560,696 465,666
Available-for-sale Securities, Gross Unrealized Gains 4,177 1,971
Available-for-sale Securities, Gross Unrealized Losses (15,046) (23,120)
Available-for-sale Securities, Fair Value and Carrying Value $ 549,827 $ 444,517
[1] (a) Derived from the audited consolidated financial statements as of September 30, 2011 and retrospectively adjusted for the finalization of provisional acquisition accounting balances (see Note 14).