Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Amortized Cost	$ 2,063	$ 1,887
Available for sale, Due after 1 year through 5 years, Amortized Cost	13,790	13,411
Available for sale, Due after 5 years though 10 years, Amortized Cost	15,488	15,032
Available for sale, Due after 10 years, Amortized Cost	4,316	4,285
Available for sale, Subtotal, Amortized Cost	35,657	34,615
Available for sale, Mortgage-backed securities, Amortized Cost	9,813	10,051
Available for sale, Amortized Cost	45,470	44,666
Available for sale, Fair Value	47,947	47,306
Held to maturity, Due in 1 year or less, Amortized Cost	496	656
Held to maturity, Due after 1 year through 5 years, Amortized Cost	1,953	1,870
Held to maturity, Due after 5 years through 10 years, Amortized Cost	2,079	2,119
Held to maturity, Due after 10 years, Amortized Cost	527	597
Held to maturity, Subtotal, Amortized Cost	5,055	5,242
Held to maturity, Mortgage backed securities, Amortized Cost	1,812	2,028
Available for sale, Due in 1 year or less, Fair Value	2,084	1,906
Available for sale, Due after 1 year through 5 years, Fair Value	14,417	14,010
Available for sale, Due after 5 years through 10 years, Fair Value	16,539	16,153
Available for sale, Due after 10 years, Fair Value	4,736	4,764
Available for sale, Subtotal, Fair Value	37,776	36,833
Available for sale, Mortgage backed securities, Fair Value	10,171	10,473
Held to maturity, Due in 1 year or less, Fair Value	499	659
Held to maturity, Due after 1 year through 5, Fair Value	2,040	1,950
Held to maturity, Due after 5 years through 10 years, Fair Value	2,220	2,267
Held to maturity, Due after 10 years, Fair Value	561	641
Held to maturity, Subtotal, Fair Value	5,320	5,517
Held to maturity, Mortgage backed securities, Fair Value	1,893	2,116
Held-to-maturity Securities	6,867	7,270
Held to maturity, Fair Value	$ 7,213	$ 7,633

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

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