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Invested Assets and Related Income - Sources of Net Investment Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment Holdings [Line Items]
Gross investment income	$ 1,556	$ 1,644	$ 1,665
Investment Expenses	38	39	35
Net Investment income	1,518	1,605	1,630
Fixed maturities [Member]
Investment Holdings [Line Items]
Gross investment income	1,465	1,549	1,564
Equity securities [Member]
Investment Holdings [Line Items]
Gross investment income	40	34	47
Short term investments [Member]
Investment Holdings [Line Items]
Gross investment income	18	16	9
Other [Member]
Investment Holdings [Line Items]
Gross investment income	$ 33	$ 45	$ 45

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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