Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investment [Line Items]
Available for sale, Due in 1 year or less, Amortized Cost	$ 2,210	$ 2,321
Available for sale, Due after 1 year through 5 years, Amortized Cost	12,591	12,325
Available for sale, Due after 5 years though 10 years, Amortized Cost	14,699	12,379
Available for sale, Due after 10 years, Amortized Cost	4,031	3,446
Available for sale, Subtotal, Amortized Cost	33,531	30,471
Available for sale, Mortgage-backed securities, Amortized Cost	10,227	9,979
Available for sale, Amortized Cost	43,758	40,450
Available for sale, Fair Value	46,504	41,967
Held to maturity, Due in 1 year or less, Amortized Cost	676	393
Held to maturity, Due after 1 year through 5 years, Amortized Cost	1,839	2,062
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,118	2,376
Held to maturity, Due after 10 years, Amortized Cost	638	667
Held to maturity, Subtotal, Amortized Cost	5,271	5,498
Held to maturity, Mortgage backed securities, Amortized Cost	2,222	2,949
Available for sale, Due in 1 year or less, Fair Value	2,231	2,349
Available for sale, Due after 1 year through 5 years, Fair Value	13,174	12,722
Available for sale, Due after 5 years through 10 years, Fair Value	15,852	12,995
Available for sale, Due after 10 years, Fair Value	4,511	3,700
Available for sale, Subtotal, Fair Value	35,768	31,766
Available for sale, Mortgage backed securities, Fair Value	10,736	10,201
Held to maturity, Due in 1 year or less, Fair Value	681	396
Held to maturity, Due after 1 year through 5, Fair Value	1,914	2,090
Held to maturity, Due after 5 years through 10 years, Fair Value	2,272	2,399
Held to maturity, Due after 10 years, Fair Value	682	684
Held to maturity, Subtotal, Fair Value	5,549	5,569
Held to maturity, Mortgage backed securities, Fair Value	2,330	3,036
Held-to-maturity Securities	7,493	8,447
Held to maturity, Fair Value	7,879	8,605
Collateralized Mortgage Backed Securities [Member]
Investment [Line Items]
Available for sale, Fair Value	10,736	10,201
Held-to-maturity Securities	2,222	2,949
Held to maturity, Fair Value	$ 2,330	$ 3,036

Subtotal of the amortized cost of AFS securities excluding mortgage-backed securities.

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