FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012 Recurring Basis	Jun. 30, 2013 Recurring Basis U.S. government and government sponsored entities	Jun. 30, 2013 Recurring Basis U.S. government and government sponsored entities	Jun. 30, 2013 Recurring Basis Non-U.S. government	Jun. 30, 2012 Recurring Basis Non-U.S. government	Jun. 30, 2013 Recurring Basis Non-U.S. government	Jun. 30, 2012 Recurring Basis Non-U.S. government	Jun. 30, 2013 Recurring Basis Level 1	Dec. 31, 2012 Recurring Basis Level 1	Jun. 30, 2013 Recurring Basis Level 1 Interest rate contracts	Dec. 31, 2012 Recurring Basis Level 1 Interest rate contracts	Jun. 30, 2013 Recurring Basis Level 1 Equity contracts	Dec. 31, 2012 Recurring Basis Level 1 Equity contracts	Jun. 30, 2013 Recurring Basis Level 1 U.S. government and government sponsored entities	Dec. 31, 2012 Recurring Basis Level 1 U.S. government and government sponsored entities	Jun. 30, 2013 Recurring Basis Level 1 Non-U.S. government	Dec. 31, 2012 Recurring Basis Level 1 Non-U.S. government	Jun. 30, 2013 Recurring Basis Level 1 Common Stock	Dec. 31, 2012 Recurring Basis Level 1 Common Stock	Jun. 30, 2013 Recurring Basis Level 1 Mutual Funds	Dec. 31, 2012 Recurring Basis Level 1 Mutual Funds	Jun. 30, 2013 Recurring Basis Level 2	Dec. 31, 2012 Recurring Basis Level 2	Jun. 30, 2013 Recurring Basis Level 2 Interest rate contracts	Dec. 31, 2012 Recurring Basis Level 2 Interest rate contracts	Jun. 30, 2013 Recurring Basis Level 2 Foreign exchange contracts	Dec. 31, 2012 Recurring Basis Level 2 Foreign exchange contracts	Jun. 30, 2013 Recurring Basis Level 2 Equity contracts	Dec. 31, 2012 Recurring Basis Level 2 Equity contracts	Jun. 30, 2013 Recurring Basis Level 2 Commodity contracts	Dec. 31, 2012 Recurring Basis Level 2 Commodity contracts	Jun. 30, 2013 Recurring Basis Level 2 Other contracts	Dec. 31, 2012 Recurring Basis Level 2 Other contracts	Jun. 30, 2013 Recurring Basis Level 2 U.S. government and government sponsored entities	Dec. 31, 2012 Recurring Basis Level 2 U.S. government and government sponsored entities	Jun. 30, 2013 Recurring Basis Level 2 Obligations of states, municipalities and political subdivisions	Dec. 31, 2012 Recurring Basis Level 2 Obligations of states, municipalities and political subdivisions	Jun. 30, 2013 Recurring Basis Level 2 Non-U.S. government	Dec. 31, 2012 Recurring Basis Level 2 Non-U.S. government	Jun. 30, 2013 Recurring Basis Level 2 Corporate debt	Dec. 31, 2012 Recurring Basis Level 2 Corporate debt	Jun. 30, 2013 Recurring Basis Level 2 Residential mortgage backed securities (RMBS)	Dec. 31, 2012 Recurring Basis Level 2 Residential mortgage backed securities (RMBS)	Jun. 30, 2013 Recurring Basis Level 2 Commercial mortgage-backed securities (CMBS)	Dec. 31, 2012 Recurring Basis Level 2 Commercial mortgage-backed securities (CMBS)	Jun. 30, 2013 Recurring Basis Level 2 Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)	Dec. 31, 2012 Recurring Basis Level 2 Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)	Dec. 31, 2012 Recurring Basis Level 2 Common Stock	Jun. 30, 2013 Recurring Basis Level 2 Preferred Stock	Dec. 31, 2012 Recurring Basis Level 2 Preferred Stock	Jun. 30, 2013 Recurring Basis Level 2 Mutual Funds	Dec. 31, 2012 Recurring Basis Level 2 Mutual Funds	Jun. 30, 2013 Recurring Basis Level 3	Dec. 31, 2012 Recurring Basis Level 3	Jun. 30, 2013 Recurring Basis Level 3 Interest rate contracts	Dec. 31, 2012 Recurring Basis Level 3 Interest rate contracts	Jun. 30, 2013 Recurring Basis Level 3 Equity contracts	Dec. 31, 2012 Recurring Basis Level 3 Equity contracts	Jun. 30, 2013 Recurring Basis Level 3 Commodity contracts	Dec. 31, 2012 Recurring Basis Level 3 Commodity contracts	Jun. 30, 2013 Recurring Basis Level 3 Credit contracts	Dec. 31, 2012 Recurring Basis Level 3 Credit contracts	Jun. 30, 2013 Recurring Basis Level 3 Other contracts	Dec. 31, 2012 Recurring Basis Level 3 Other contracts	Jun. 30, 2013 Recurring Basis Level 3 Obligations of states, municipalities and political subdivisions	Dec. 31, 2012 Recurring Basis Level 3 Obligations of states, municipalities and political subdivisions	Jun. 30, 2013 Recurring Basis Level 3 Non-U.S. government	Dec. 31, 2012 Recurring Basis Level 3 Non-U.S. government	Jun. 30, 2013 Recurring Basis Level 3 Corporate debt	Dec. 31, 2012 Recurring Basis Level 3 Corporate debt	Jun. 30, 2013 Recurring Basis Level 3 Residential mortgage backed securities (RMBS)	Dec. 31, 2012 Recurring Basis Level 3 Residential mortgage backed securities (RMBS)	Jun. 30, 2013 Recurring Basis Level 3 Commercial mortgage-backed securities (CMBS)	Dec. 31, 2012 Recurring Basis Level 3 Commercial mortgage-backed securities (CMBS)	Jun. 30, 2013 Recurring Basis Level 3 Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)	Dec. 31, 2012 Recurring Basis Level 3 Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)	Jun. 30, 2013 Recurring Basis Level 3 Common Stock	Dec. 31, 2012 Recurring Basis Level 3 Common Stock	Jun. 30, 2013 Recurring Basis Level 3 Preferred Stock	Dec. 31, 2012 Recurring Basis Level 3 Preferred Stock	Jun. 30, 2013 Recurring Basis Counterparty Netting	Dec. 31, 2012 Recurring Basis Counterparty Netting	Jun. 30, 2013 Recurring Basis Counterparty Netting Counterparty netting and cash collateral	Dec. 31, 2012 Recurring Basis Counterparty Netting Counterparty netting and cash collateral	Jun. 30, 2013 Recurring Basis Cash Collateral	Dec. 31, 2012 Recurring Basis Cash Collateral	Jun. 30, 2013 Recurring Basis Cash Collateral Counterparty netting and cash collateral	Dec. 31, 2012 Recurring Basis Cash Collateral Counterparty netting and cash collateral	Jun. 30, 2013 Recurring Basis Total Fair Value	Dec. 31, 2012 Recurring Basis Total Fair Value	Jun. 30, 2013 Recurring Basis Total Fair Value Interest rate contracts	Dec. 31, 2012 Recurring Basis Total Fair Value Interest rate contracts	Jun. 30, 2013 Recurring Basis Total Fair Value Foreign exchange contracts	Dec. 31, 2012 Recurring Basis Total Fair Value Foreign exchange contracts	Jun. 30, 2013 Recurring Basis Total Fair Value Equity contracts	Dec. 31, 2012 Recurring Basis Total Fair Value Equity contracts	Jun. 30, 2013 Recurring Basis Total Fair Value Commodity contracts	Dec. 31, 2012 Recurring Basis Total Fair Value Commodity contracts	Jun. 30, 2013 Recurring Basis Total Fair Value Credit contracts	Dec. 31, 2012 Recurring Basis Total Fair Value Credit contracts	Jun. 30, 2013 Recurring Basis Total Fair Value Other contracts	Dec. 31, 2012 Recurring Basis Total Fair Value Other contracts	Jun. 30, 2013 Recurring Basis Total Fair Value Counterparty netting and cash collateral	Dec. 31, 2012 Recurring Basis Total Fair Value Counterparty netting and cash collateral	Jun. 30, 2013 Recurring Basis Total Fair Value U.S. government and government sponsored entities	Dec. 31, 2012 Recurring Basis Total Fair Value U.S. government and government sponsored entities	Jun. 30, 2013 Recurring Basis Total Fair Value Obligations of states, municipalities and political subdivisions	Dec. 31, 2012 Recurring Basis Total Fair Value Obligations of states, municipalities and political subdivisions	Jun. 30, 2013 Recurring Basis Total Fair Value Non-U.S. government	Dec. 31, 2012 Recurring Basis Total Fair Value Non-U.S. government	Jun. 30, 2013 Recurring Basis Total Fair Value Corporate debt	Dec. 31, 2012 Recurring Basis Total Fair Value Corporate debt	Jun. 30, 2013 Recurring Basis Total Fair Value Residential mortgage backed securities (RMBS)	Dec. 31, 2012 Recurring Basis Total Fair Value Residential mortgage backed securities (RMBS)	Jun. 30, 2013 Recurring Basis Total Fair Value Commercial mortgage-backed securities (CMBS)	Dec. 31, 2012 Recurring Basis Total Fair Value Commercial mortgage-backed securities (CMBS)	Jun. 30, 2013 Recurring Basis Total Fair Value Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)	Dec. 31, 2012 Recurring Basis Total Fair Value Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)	Jun. 30, 2013 Recurring Basis Total Fair Value Common Stock	Dec. 31, 2012 Recurring Basis Total Fair Value Common Stock	Jun. 30, 2013 Recurring Basis Total Fair Value Preferred Stock	Dec. 31, 2012 Recurring Basis Total Fair Value Preferred Stock	Jun. 30, 2013 Recurring Basis Total Fair Value Mutual Funds	Dec. 31, 2012 Recurring Basis Total Fair Value Mutual Funds
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale										$ 828	$ 1,004					$ 266		$ 562	$ 1,004					$ 232,511	$ 244,803											$ 3,264	$ 3,483	$ 31,783	$ 34,681	$ 23,047	$ 25,782	$ 142,323	$ 149,625	$ 23,288	$ 22,730	$ 5,226	$ 5,010	$ 3,580	$ 3,492						$ 27,890	$ 24,152											$ 945	$ 1,024	$ 20	$ 14	$ 1,634	$ 1,487	$ 13,694	$ 11,662	$ 5,455	$ 4,905	$ 6,142	$ 5,060													$ 261,229	$ 269,959															$ 3,530	$ 3,483	$ 32,728	$ 35,705	$ 23,629	$ 26,800	$ 143,957	$ 151,112	$ 36,982	$ 34,392	$ 10,681	$ 9,915	$ 9,722	$ 8,552
Bond trading securities, at fair value	23,789	24,584								164	266					164	266							13,051	14,574											5,897	6,528	181		2	2	1,098	1,320	1,404	1,331	881	1,424	3,588	3,969						10,574	9,744																	782	396	820	803	8,972	8,545													23,789	24,584															6,061	6,794	181		2	2	1,098	1,320	2,186	1,727	1,701	2,227	12,560	12,514
Equity securities available for sale	3,153	3,212								2,987	3,085									2,817	3,002	170	83	42	59																									3	33	34	9	22	124	68																							76	24	48	44									3,153	3,212																													2,893	3,029	81	78	179	105
Equity securities trading	758	662								676	578													82	84																																																																		758	662
Mortgage and other loans receivable																								59	134																																																																		59	134
Other invested assets	7,871	7,056								11	125													2,221	1,542																														5,639	5,389																																			7,871	7,056
Derivative assets, at fair value	2,805	3,671								145	106	8	2	137	104									4,405	5,832	4,109	5,521	117	104	55	63	123	144	1																					1,127	1,109	961	956	73	54	1	1	56	60	36	38																	(2,011)	(2,467)	(2,011)	(2,467)	(861)	(909)	(861)	(909)	2,805	3,671	5,078	6,479	117	104	265	221	124	145	56	60	37	38	(2,872)	(3,376)
Short-term investments, portion measured at fair value	6,099	8,056								215	285													5,884	7,771																																																																		6,099	8,056
Separate account assets, at fair value	61,759	57,337								58,796	54,430													2,963	2,907																																																																		61,759	57,337
Other assets	582	696																						582	696																																																																		582	696
Fair value assets measured on recurring basis, total										63,822	59,879													261,800	278,402																														45,354	40,462																											(2,011)	(2,467)			(861)	(909)			368,104	375,367
Fair Value, Liabilities Measured on Recurring Basis
Policyholder contract deposits, portion measured at fair value	586	1,257																																																					586	1,257																																			586	1,257
Derivative liabilities, at fair value	3,124	4,061																						4,771	6,022	4,359	5,582	155	174	104	114	127	146	26	6																				1,976	2,482	182	224	3	7			1,650	2,051	141	200																	(2,011)	(2,467)	(2,011)	(2,467)	(1,612)	(1,976)	(1,612)	(1,976)	3,124	4,061	4,541	5,806	155	174	107	121	127	146	1,650	2,051	167	206	(3,623)	(4,443)
Long-term debt, portion measured at fair value	7,013	8,055																						6,594	7,711																														419	344																																			7,013	8,055
Other liabilities	867	1,080								116	30													751	1,050																																																																		867	1,080
Fair value liabilities measured on recurring basis, total										116	30													12,116	14,783																														2,981	4,083																											(2,011)	(2,467)			(1,612)	(1,976)			11,590	14,453
Securities collateral posted for derivative transactions																																																																																							1,400	1,900
Securities collateral received not reflected in balance sheet																																																																																							143	299
Assets transferred from Level 1 to Level 2				0	93.0	318.0	135.9	557.0	135.9
Assets transferred from Level 2 to Level 1			$ 0