Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Investments [Abstract]
Available for sale; maturity period, Due in 1 year or less, Amortized Cost	$ 2,048	$ 1,846
Available for sale; maturity period, Due after 1 year through 5 years, Amortized Cost	12,610	13,094
Available for sale; maturity period, Due after 5 years though 10 years, Amortized Cost	11,885	10,276
Available for sale; maturity period, Due after 10 years, Amortized Cost	3,483	2,818
Available for sale; maturity period, Subtotal, Amortized Cost	30,026	28,034
Available for sale; maturity period, Mortgage-backed securities, Amortized Cost	10,308	8,508
Available for sale; maturity period, Amortized Cost	40,334	36,542
Available for sale; maturity period, Due in 1 year or less, Fair Value	2,077	1,985
Available for sale; maturity period, Due after 1 year through 5 years, Fair Value	12,997	13,444
Available for sale; maturity period, Due after 5 years through 10 years, Fair Value	12,267	10,782
Available for sale; maturity period, Due after 10 years, Fair Value	3,687	2,812
Available for sale; maturity period, Subtotal, Fair Value	31,028	29,023
Available for sale; maturity period, Mortgage backed securities, Fair Value	10,549	8,516
Available for sale; maturity period, Fair Value	41,577	37,539
Held to maturity; maturity period, Due in 1 year or less, Amortized Cost	351	400
Held to maturity; maturity period, Due after 1 year through 5 years, Amortized Cost	2,055	1,983
Held to maturity; maturity period, Due after 5 years through 10 years, Amortized Cost	2,481	2,613
Held to maturity; maturity period, Due after 10 years, Amortized Cost	663	694
Held to maturity; maturity period, Subtotal, Amortized Cost	5,550	5,690
Held to maturity; maturity period, Mortgage backed securities, Amortized Cost	3,181	3,811
Held to maturity; maturity period, Amortized Cost	8,731	9,501
Held to maturity; maturity period, Due in 1 year or less, Fair Value	354	404
Held to maturity; maturity period, Due after 1 year through 5, Fair Value	2,084	2,010
Held to maturity; maturity period, Due after 5 years through 10 years, Fair Value	2,483	2,524
Held to maturity; maturity period, Due after 10 years, Fair Value	680	677
Held to maturity; maturity period, Subtotal, Fair Value	5,601	5,615
Held to maturity; maturity period, Mortgage backed securities, Fair Value	3,272	3,846
Held to maturity; maturity period, Fair Value	$ 8,873	$ 9,461

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

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