Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	$ 76,703	$ 73,532
Gross Unrealized Gains	5,630	9,884
Gross Unrealized Losses	1,160	320
Gross Unrealized OTTI	154	195
Fair Value	81,019	82,901
Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	76,537	73,395
Gross Unrealized Gains	5,611	9,862
Gross Unrealized Losses	1,160	318
Gross Unrealized OTTI	154	195
Fair Value	80,834	82,744
Equity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	166	137
Gross Unrealized Gains	19	22
Gross Unrealized Losses		2
Fair Value	185	157
Corporate Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	64,933	60,124
Gross Unrealized Gains	4,739	8,219
Gross Unrealized Losses	1,056	219
Gross Unrealized OTTI	91	108
Fair Value	68,525	68,016
Fixed maturity U.S. Government Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	345	383
Gross Unrealized Gains	32	59
Gross Unrealized Losses	9
Fair Value	368	442
Foreign Government Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	523	562
Gross Unrealized Gains	53	92
Fair Value	576	654
RMBS [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	4,396	5,763
Gross Unrealized Gains	294	471
Gross Unrealized Losses	1	3
Gross Unrealized OTTI	39	60
Fair Value	4,650	6,171
CMBS [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	776	970
Gross Unrealized Gains	40	68
Gross Unrealized Losses	4	16
Gross Unrealized OTTI	17	19
Fair Value	795	1,003
CDOs [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	202	189
Gross Unrealized Gains		2
Gross Unrealized Losses	1	3
Gross Unrealized OTTI	7	8
Fair Value	194	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	3,654	3,546
Gross Unrealized Gains	346	814
Gross Unrealized Losses	24	7
Fair Value	3,976	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	1,027	1,181
Gross Unrealized Gains	89	106
Gross Unrealized Losses	65	70
Fair Value	1,051	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	681	677
Gross Unrealized Gains	18	31
Fair Value	$ 699	$ 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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