Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	$ 76,341	$ 73,532
Gross Unrealized Gains	5,996	9,884
Gross Unrealized Losses	1,040	320
Gross Unrealized OTTI	155	195
Fair Value	81,142	82,901
Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	76,149	73,395
Gross Unrealized Gains	5,978	9,862
Gross Unrealized Losses	1,039	318
Gross Unrealized OTTI	155	195
Fair Value	80,933	82,744
Equity AFS Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	192	137
Gross Unrealized Gains	18	22
Gross Unrealized Losses	1	2
Fair Value	209	157
Corporate Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	63,980	60,124
Gross Unrealized Gains	4,978	8,219
Gross Unrealized Losses	929	219
Gross Unrealized OTTI	91	108
Fair Value	67,938	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	378	383
Gross Unrealized Gains	36	59
Gross Unrealized Losses	6
Fair Value	408	442
Foreign Government Bonds [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	508	562
Gross Unrealized Gains	56	92
Fair Value	564	654
RMBS [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	4,816	5,763
Gross Unrealized Gains	312	471
Gross Unrealized Losses	10	3
Gross Unrealized OTTI	40	60
Fair Value	5,078	6,171
CMBS [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	857	970
Gross Unrealized Gains	46	68
Gross Unrealized Losses	3	16
Gross Unrealized OTTI	17	19
Fair Value	883	1,003
CDOs [Member] \| Fixed Maturity Securities [Member]
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities
Amortized cost	174	189
Gross Unrealized Gains		2
Gross Unrealized Losses	2	3
Gross Unrealized OTTI	7	8
Fair Value	165	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	3,622	3,546
Gross Unrealized Gains	442	814
Gross Unrealized Losses	16	7
Fair Value	4,048	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	1,134	1,181
Gross Unrealized Gains	90	106
Gross Unrealized Losses	73	70
Fair Value	1,151	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	680	677
Gross Unrealized Gains	18	31
Fair Value	$ 698	$ 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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