INVESTMENTS (OFFSETTING) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Offsetting Assets [Line Items]
Securities purchased under agreements to resell	$ 79	$ 0
Securities sold under agreements to repurchase	1,890	950
ASSETS
Gross Amounts Recognized	79
Gross Amounts Offset in the Balance Sheets	0
Net Amounts Presented in the Balance Sheets	79
LIABILITIES
Gross Amounts Recognized	0
Gross Amounts Offset in the Balance Sheets	0
Net Amounts Presented in the Balance Sheets	0
Asset Derivatives	12,055	12,757
Accrued Interest Derivatives	141	120
Liability Derivatives	1,320	1,309
Investment Management
LIABILITIES
Asset Derivatives	13	8
Securities Borrowed	75	158
Liability Derivatives	12	9
Securities Loaned	10	34
Equity Contract
ASSETS
Gross Amounts Recognized	1,049	1,236
Gross Amounts Offset in the Balance Sheets	673	753
Net Amounts Presented in the Balance Sheets	376	483
LIABILITIES
Gross Amounts Recognized	673	753
Gross Amounts Offset in the Balance Sheets	673	753
Net Amounts Presented in the Balance Sheets	0	0
Interest Rate Contract
ASSETS
Gross Amounts Recognized	389	755
Gross Amounts Offset in the Balance Sheets	104	12
Net Amounts Presented in the Balance Sheets	285	743
LIABILITIES
Gross Amounts Recognized	104	12
Gross Amounts Offset in the Balance Sheets	104	12
Net Amounts Presented in the Balance Sheets	0	0
Credit default swaps
ASSETS
Gross Amounts Recognized	14	7
Gross Amounts Offset in the Balance Sheets	37	27
Net Amounts Presented in the Balance Sheets	(23)	(20)
LIABILITIES
Gross Amounts Recognized	37
Gross Amounts Offset in the Balance Sheets	37
Net Amounts Presented in the Balance Sheets	0
Asset Derivatives	16	9
Liability Derivatives	38	27
Derivatives Subject to an ISDA Master Agreements
ASSETS
Gross Amounts Recognized	1,452	1,998
Gross Amounts Offset in the Balance Sheets	814	792
Net Amounts Presented in the Balance Sheets	638	1,206
LIABILITIES
Gross Amounts Recognized	814	765
Gross Amounts Offset in the Balance Sheets	814	765
Net Amounts Presented in the Balance Sheets	0	0
Derivatives not subject to an ISDA Master Agreements
ASSETS
Gross Amounts Recognized	20	40
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	20	40
LIABILITIES
Gross Amounts Recognized		0
Gross Amounts Offset in the Balance Sheets		0
Net Amounts Presented in the Balance Sheets		0
Derivative investments
ASSETS
Gross Amounts Recognized	1,472	2,038
Gross Amounts Offset in the Balance Sheets	814	792
Net Amounts Presented in the Balance Sheets	658	1,246
LIABILITIES
Gross Amounts Recognized	814	765
Gross Amounts Offset in the Balance Sheets	814	765
Net Amounts Presented in the Balance Sheets	0	0
Other Financial Instruments
ASSETS
Gross Amounts Recognized	1,271	852
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	1,271	852
Other Invested Assets
ASSETS
Gross Amounts Recognized	2,743	2,890
Gross Amounts Offset in the Balance Sheets	814	792
Net Amounts Presented in the Balance Sheets	1,929	2,098
Other financial liabilities
LIABILITIES
Gross Amounts Recognized	2,586	2,939
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	2,586	2,939
Other liabilities
LIABILITIES
Gross Amounts Recognized	3,400	3,704
Gross Amounts Offset in the Balance Sheets	814	765
Net Amounts Presented in the Balance Sheets	2,586	2,939
Securities sold under agreement to repurchase
LIABILITIES
Gross Amounts Recognized	1,890	950
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	1,890	950
Exchange Traded Options | Investment Management | Long
LIABILITIES
Asset Derivatives	6	22
Exchange Traded Options | Investment Management | Short
LIABILITIES
Liability Derivatives	1	$ 7
Initial Margin
LIABILITIES
Asset Derivatives	$ (2)