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Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Available for sale, Due in 1 year or less, Amortized Cost $ 1,906 $ 2,187
Available for sale, Due after 1 year through 5 years, Amortized Cost 16,377 15,444
Available for sale, Due after 5 years though 10 years, Amortized Cost 14,321 15,663
Available for sale, Due after 10 years, Amortized Cost 4,388 4,521
Available for sale, Subtotal, Amortized Cost 36,992 37,815
Available for sale, Mortgage-backed securities, Amortized Cost 10,607 10,011
Available for sale, Amortized Cost 47,599 47,826
Available for sale, Fair Value 48,701 49,395
Held to maturity, Due in 1 year or less, Amortized Cost 377 353
Held to maturity, Due after 1 year through 5 years, Amortized Cost 2,589 2,603
Held to maturity, Due after 5 years through 10 years, Amortized Cost 2,351 1,439
Held to maturity, Due after 10 years, Amortized Cost 1,531 953
Held to maturity, Subtotal, Amortized Cost 6,848 5,348
Held to maturity, Mortgage backed securities, Amortized Cost 1,828 1,983
Available for sale, Due in 1 year or less, Fair Value 1,925 2,206
Available for sale, Due after 1 year through 5 years, Fair Value 16,808 15,857
Available for sale, Due after 5 years through 10 years, Fair Value 14,549 16,089
Available for sale, Due after 10 years, Fair Value 4,635 4,957
Available for sale, Subtotal, Fair Value 37,917 39,109
Available for sale, Mortgage backed securities, Fair Value 10,784 10,286
Held to maturity, Due in 1 year or less, Fair Value 381 355
Held to maturity, Due after 1 year through 5, Fair Value 2,685 2,693
Held to maturity, Due after 5 years through 10 years, Fair Value 2,351 1,489
Held to maturity, Due after 10 years, Fair Value 1,511 1,013
Held to maturity, Subtotal, Fair Value 6,928 5,550
Held to maturity, Mortgage backed securities, Fair Value 1,877 2,039
Held to maturity, Amortized Cost 8,676 7,331
Held to maturity, Fair Value $ 8,805 $ 7,589