Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	$ 74,888	$ 73,352
Gross Unrealized Gains	9,167	9,884
Gross Unrealized Losses	329	320
Gross Unrealized OTTI	159	195
Fair Value	83,567	82,901
Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	74,757	73,395
Gross Unrealized Gains	9,148	9,862
Gross Unrealized Losses	327	318
Gross Unrealized OTTI	159	195
Fair Value	83,419	82,744
Equity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	131	137
Gross Unrealized Gains	19	22
Gross Unrealized Losses	2	2
Fair Value	148	157
Corporate Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	62,030	60,124
Gross Unrealized Gains	7,574	8,219
Gross Unrealized Losses	238	219
Gross Unrealized OTTI	92	108
Fair Value	69,274	68,016
U.S. Government Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	381	383
Gross Unrealized Gains	51	59
Fair Value	432	442
Foreign Government Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	546	562
Gross Unrealized Gains	80	92
Fair Value	626	654
RMBS [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	5,200	5,763
Gross Unrealized Gains	429	471
Gross Unrealized Losses		3
Gross Unrealized OTTI	43	60
Fair Value	5,586	6,171
CMBS [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	926	970
Gross Unrealized Gains	61	68
Gross Unrealized Losses	14	16
Gross Unrealized OTTI	17	19
Fair Value	956	1,003
CDOs [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	181	189
Gross Unrealized Gains	1	2
Gross Unrealized Losses	2	3
Gross Unrealized OTTI	7	8
Fair Value	173	180
State And Municipal Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	3,625	3,546
Gross Unrealized Gains	810	814
Gross Unrealized Losses	5	7
Fair Value	4,430	4,353
Hybrid And Redeemable Preferred Securities [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	1,189	1,181
Gross Unrealized Gains	113	106
Gross Unrealized Losses	68	70
Fair Value	1,234	1,217
VIEs' Fixed Maturity Securities [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	679	677
Gross Unrealized Gains	29	31
Fair Value	$ 708	$ 708

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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