Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 2,102	$ 1,887
Available for sale, Due after 1 year through 5 years, Amortized Cost	14,042	13,411
Available for sale, Due after 5 years though 10 years, Amortized Cost	15,833	15,032
Available for sale, Due after 10 years, Amortized Cost	4,292	4,285
Available for sale, Subtotal, Amortized Cost	36,269	34,615
Available for sale, Mortgage-backed securities, Amortized Cost	9,719	10,051
Available for sale, Amortized Cost	45,988	44,666
Available for sale, Fair Value	47,016	47,306
Held to maturity, Due in 1 year or less, Amortized Cost	447	656
Held to maturity, Due after 1 year through 5 years, Amortized Cost	2,218	1,870
Held to maturity, Due after 5 years through 10 years, Amortized Cost	1,833	2,119
Held to maturity, Due after 10 years, Amortized Cost	463	597
Held to maturity, Subtotal, Amortized Cost	4,961	5,242
Held to maturity, Mortgage backed securities, Amortized Cost	1,615	2,028
Available for sale, Due in 1 year or less, Fair Value	2,121	1,906
Available for sale, Due after 1 year through 5 years, Fair Value	14,493	14,010
Available for sale, Due after 5 years through 10 years, Fair Value	16,179	16,153
Available for sale, Due after 10 years, Fair Value	4,445	4,764
Available for sale, Subtotal, Fair Value	37,238	36,833
Available for sale, Mortgage backed securities, Fair Value	9,778	10,473
Held to maturity, Due in 1 year or less, Fair Value	451	659
Held to maturity, Due after 1 year through 5, Fair Value	2,288	1,950
Held to maturity, Due after 5 years through 10 years, Fair Value	1,878	2,267
Held to maturity, Due after 10 years, Fair Value	478	641
Held to maturity, Subtotal, Fair Value	5,095	5,517
Held to maturity, Mortgage backed securities, Fair Value	1,667	2,116
Held-to-maturity Securities	6,576	7,270
Held to maturity, Fair Value	$ 6,762	$ 7,633

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

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