Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012
Amortized cost and fair value of fixed maturity available-for-sale securities
Total fixed maturity available-for-sale securities, Amortized Cost	$ 14,379,247
Total fixed maturity available-for-sale securities, Fair Value	15,069,952
Asset-backed securities [Member]
Amortized cost and fair value of fixed maturity available-for-sale securities
Other securities which provide for periodic payments, Amortized Cost	821,203
Other securities which provide for periodic payments, Fair Value	822,686
Commercial-mortgage-backed securities [Member]
Amortized cost and fair value of fixed maturity available-for-sale securities
Other securities which provide for periodic payments, Amortized Cost	520,806
Other securities which provide for periodic payments, Fair Value	538,523
Structured hybrids [Member]
Amortized cost and fair value of fixed maturity available-for-sale securities
Other securities which provide for periodic payments, Amortized Cost	145,366
Other securities which provide for periodic payments, Fair Value	133,820
Agency residential mortgage-backed securities [Member]
Amortized cost and fair value of fixed maturity available-for-sale securities
Other securities which provide for periodic payments, Amortized Cost	163,855
Other securities which provide for periodic payments, Fair Value	168,026
Non-agency residential mortgage-backed securities [Member]
Amortized cost and fair value of fixed maturity available-for-sale securities
Other securities which provide for periodic payments, Amortized Cost	560,696
Other securities which provide for periodic payments, Fair Value	549,827
Corporate [Member] \| Municipal [Member] \| Non-structured Hybrids [Member] \| U.S. Government securities [Member]
Amortized cost and fair value of fixed maturity available-for-sale securities
Due in one year or less, Amortized Cost	883,426
Due in one year or less, Fair Value	885,160
Due after one year through five years, Amortized Cost	2,425,302
Due after one year through five years, Fair Value	2,483,897
Due after five years through ten years, Amortized Cost	3,491,058
Due after five years through ten years, Fair Value	3,687,917
Due after ten years, Amortized Cost	5,367,535
Due after ten years, Fair Value	5,800,096
Subtotal, Amortized Cost	12,167,321
Subtotal, Fair Value	$ 12,857,070

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