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Notes Payable and Debt and Financing Arrangements (Detail) (USD $)	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Proceeds from Issuance of Senior Long-term Debt	$ 600,000,000
Debt Instrument, Interest Rate, Effective Percentage	6.50%
Required Statutory Capital and Surplus for Principal Operating Subsidiares		6,700,000,000
Line of Credit Facility, Increase, Additional Borrowings		$ 500,000,000	$ 500,000,000

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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