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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 30, 2012
Total fixed maturity available-for-sale securities, Amortized Cost $ 15,473.9
Total fixed maturity available-for-sale securities, Fair Value 16,476.6
Asset-backed securities [Member]
  
Other securities which provide for periodic payments, Amortized Cost 1,263.7
Other securities which provide for periodic payments, Fair Value 1,290.7
Commercial mortgage-backed securities [Member]
  
Other securities which provide for periodic payments, Amortized Cost 526.5
Other securities which provide for periodic payments, Fair Value 563.6
Structured hybrids [Member]
  
Other securities which provide for periodic payments, Amortized Cost 83.6
Other securities which provide for periodic payments, Fair Value 84.0
Agency residential mortgage-backed securities [Member]
  
Other securities which provide for periodic payments, Amortized Cost 135.8
Other securities which provide for periodic payments, Fair Value 140.0
Non-agency residential mortgage-backed securities [Member]
  
Other securities which provide for periodic payments, Amortized Cost 914.2
Other securities which provide for periodic payments, Fair Value 969.3
Non-structured Hybrids [Member] | Corporate [Member] | Municipal [Member] | U.S. Government securities [Member]
  
Due in one year or less, Amortized Cost 622.0
Due after one year through five years, Amortized Cost 4,175.7
Due after five years through ten years, Amortized Cost 3,419.4
Due after ten years, Amortized Cost 4,333.0
Subtotal, Amortized Cost 12,550.1
Due in one year or less, Fair Value 624.7
Due after one year through five years, Fair Value 4,263.1
Due after five years through ten years, Fair Value 3,690.8
Due after ten years, Fair Value 4,850.4
Subtotal, Fair Value $ 13,429.0