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Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts (Schedule Of Guaranteed Minimum Death Benefits And Guaranteed Minimum Income Benefits Income And Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	$ 3,381	$ 3,309
Policy benefits and other reserve adjustments	147	91
Net realized gains (losses)	260	(45)
Guaranteed Minimum Death Benefits [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	23	26
Policy benefits and other reserve adjustments	27	22
Guaranteed Living Benefits [Member]
Guaranteed Minimum Benefits [Line Items]
Net premiums earned	41	41
Policy benefits and other reserve adjustments	4	6
Net realized gains (losses)	458	58
Gain recognized in income	495	93
Net cash received	39	41
Net decrease in liability	$ 456	$ 52

- 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