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Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Schedule Of Guaranteed Minimum Benefits Income And Expense) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	$ 3,573	$ 3,381
Policy benefits and other reserve adjustments	131	147
Net realized gains (losses)	206	260
Guaranteed Minimum Death Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	20	23
Policy benefits and other reserve adjustments	19	27
Guaranteed Minimum Income Benefit [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	39	41
Policy benefits and other reserve adjustments	9	4
Net realized gains (losses)	369	458
(Loss) gain recognized in income	399	495
Net cash received	32	39
Net (increase) decrease in liability	$ 367	$ 456

- Definition

Total net amount of increases and decreases to the liability for guaranteed minimum benefits on long-duration contracts occurring during the period, for all guaranteed benefit types.

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- Definition

Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.

+ References+ Details