Investments (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	$ 240,848,000,000	$ 223,240,000,000
Available-for-sale Securities, Gross Unrealized Gains	16,259,000,000	14,782,000,000
Available-for-sale Securities, Gross Unrealized Losses	(3,619,000,000)	(5,139,000,000)
Available for Sale Securities, fair value	253,488,000,000	232,883,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	(209,000,000)	(761,000,000)
Other details of available-for-sale securities
Available for sale securities at fair value from businesses held for sale	47,200,000,000	80,500,000,000
U.S. government and government sponsored entities \| Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	8,287,000,000	7,239,000,000
Available-for-sale Securities, Gross Unrealized Gains	218,000,000	184,000,000
Available-for-sale Securities, Gross Unrealized Losses	(28,000,000)	(73,000,000)
Available for Sale Securities, fair value	8,477,000,000	7,350,000,000
Obligations of states, municipalities and Political subdivisions \| Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	37,752,000,000	45,297,000,000
Available-for-sale Securities, Gross Unrealized Gains	1,760,000,000	1,725,000,000
Available-for-sale Securities, Gross Unrealized Losses	(175,000,000)	(402,000,000)
Available for Sale Securities, fair value	39,337,000,000	46,620,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	(30,000,000)	2,000,000
Non-U.S. government \| Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	17,415,000,000	14,780,000,000
Available-for-sale Securities, Gross Unrealized Gains	538,000,000	639,000,000
Available-for-sale Securities, Gross Unrealized Losses	(98,000,000)	(75,000,000)
Available for Sale Securities, fair value	17,855,000,000	15,344,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI		(28,000,000)
Corporate debt \| Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	129,770,000,000	118,729,000,000
Available-for-sale Securities, Gross Unrealized Gains	9,333,000,000	8,827,000,000
Available-for-sale Securities, Gross Unrealized Losses	(946,000,000)	(1,198,000,000)
Available for Sale Securities, fair value	138,157,000,000	126,358,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	112,000,000	99,000,000
Prime residential mortgages \| Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	31,566,000,000	20,661,000,000
Available-for-sale Securities, Gross Unrealized Gains	1,102,000,000	700,000,000
Available-for-sale Securities, Gross Unrealized Losses	(1,258,000,000)	(1,553,000,000)
Available for Sale Securities, fair value	31,410,000,000	19,808,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	(418,000,000)	(648,000,000)
Commercial mortgage-backed securities (CMBS) \| Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	8,012,000,000	7,320,000,000
Available-for-sale Securities, Gross Unrealized Gains	411,000,000	240,000,000
Available-for-sale Securities, Gross Unrealized Losses	(693,000,000)	(1,149,000,000)
Available for Sale Securities, fair value	7,730,000,000	6,411,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	33,000,000	(218,000,000)
Bonds available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	239,090,000,000	220,669,000,000
Available-for-sale Securities, Gross Unrealized Gains	13,850,000,000	12,717,000,000
Available-for-sale Securities, Gross Unrealized Losses	(3,580,000,000)	(5,084,000,000)
Available for Sale Securities, fair value	249,360,000,000	228,302,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	(209,000,000)	(761,000,000)
Other details of available-for-sale securities
Available for sale securities not rated or rated below investment grade	21,300,000,000	18,600,000,000
Bonds available for sale \| Mortgage backed, asset backed and collateralized
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	45,866,000,000	34,624,000,000
Available-for-sale Securities, Gross Unrealized Gains	2,001,000,000	1,342,000,000
Available-for-sale Securities, Gross Unrealized Losses	(2,333,000,000)	(3,336,000,000)
Available for Sale Securities, fair value	45,534,000,000	32,630,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	(291,000,000)	(834,000,000)
Bonds available for sale \| Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	6,288,000,000	6,643,000,000
Available-for-sale Securities, Gross Unrealized Gains	488,000,000	402,000,000
Available-for-sale Securities, Gross Unrealized Losses	(382,000,000)	(634,000,000)
Available for Sale Securities, fair value	6,394,000,000	6,411,000,000
Available-for-sale Securities, Other-Than- Temporary Impairments in AOCI	94,000,000	32,000,000
Common Stock \| Equity securities available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	1,609,000,000	1,820,000,000
Available-for-sale Securities, Gross Unrealized Gains	2,355,000,000	1,931,000,000
Available-for-sale Securities, Gross Unrealized Losses	(38,000,000)	(52,000,000)
Available for Sale Securities, fair value	3,926,000,000	3,699,000,000
Preferred Stock. \| Equity securities available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	94,000,000	400,000,000
Available-for-sale Securities, Gross Unrealized Gains	31,000,000	88,000,000
Available-for-sale Securities, Gross Unrealized Losses		(1,000,000)
Available for Sale Securities, fair value	125,000,000	487,000,000
Mutual Funds \| Equity securities available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	55,000,000	351,000,000
Available-for-sale Securities, Gross Unrealized Gains	23,000,000	46,000,000
Available-for-sale Securities, Gross Unrealized Losses	(1,000,000)	(2,000,000)
Available for Sale Securities, fair value	77,000,000	395,000,000
Equity securities available for sale
Schedule of Gross Unrealized Gains and Losses on Available For Sale Securities
Available-for-sale Securities, Amortized Cost or Cost	1,758,000,000	2,571,000,000
Available-for-sale Securities, Gross Unrealized Gains	2,409,000,000	2,065,000,000
Available-for-sale Securities, Gross Unrealized Losses	(39,000,000)	(55,000,000)
Available for Sale Securities, fair value	$ 4,128,000,000	$ 4,581,000,000

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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