Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 1,887	$ 2,321
Available for sale, Due after 1 year through 5 years, Amortized Cost	13,411	12,325
Available for sale, Due after 5 years though 10 years, Amortized Cost	15,032	12,379
Available for sale, Due after 10 years, Amortized Cost	4,285	3,446
Available for sale, Subtotal, Amortized Cost	34,615	30,471
Available for sale, Mortgage-backed securities, Amortized Cost	10,051	9,979
Available for sale, Amortized Cost	44,666	40,450
Available for sale, Due in 1 year or less, Fair Value	1,906	2,349
Available for sale, Due after 1 year through 5 years, Fair Value	14,010	12,722
Available for sale, Due after 5 years through 10 years, Fair Value	16,153	12,995
Available for sale, Due after 10 years, Fair Value	4,764	3,700
Available for sale, Subtotal, Fair Value	36,833	31,766
Available for sale, Mortgage backed securities, Fair Value	10,473	10,201
Available for sale, Fair Value	47,306	41,967
Held to maturity, Due in 1 year or less, Amortized Cost	656	393
Held to maturity, Due after 1 year through 5 years, Amortized Cost	1,870	2,062
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,119	2,376
Held to maturity, Due after 10 years, Amortized Cost	597	667
Held to maturity, Subtotal, Amortized Cost	5,242	5,498
Held to maturity, Mortgage backed securities, Amortized Cost	2,028	2,949
Held-to-maturity Securities	7,270	8,447
Held to maturity, Due in 1 year or less, Fair Value	659	396
Held to maturity, Due after 1 year through 5, Fair Value	1,950	2,090
Held to maturity, Due after 5 years through 10 years, Fair Value	2,267	2,399
Held to maturity, Due after 10 years, Fair Value	641	684
Held to maturity, Subtotal, Fair Value	5,517	5,569
Held to maturity, Mortgage backed securities, Fair Value	2,116	3,036
Held to maturity, Fair Value	$ 7,633	$ 8,605

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

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