INVESTMENTS (OFFSETTING) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Offsetting Assets [Line Items]
Interest Expense, Securities Sold under Agreements to Repurchase	$ 5	$ 4
Securities sold under agreements to repurchase	1,887	1,996
LIABILITIES
Gross Amounts Recognized	0
Gross Amounts Offset in the Balance Sheets	0
Net Amounts Presented in the Balance Sheets	0
Expense in securities sold under agreement to repurchase	3		$ 4
Equity contracts
ASSETS
Gross Amounts Recognized	3,339	2,128
Gross Amounts Offset in the Balance Sheets	1,555	1,221
Net Amounts Presented in the Balance Sheets	1,784	907
LIABILITIES
Gross Amounts Recognized	1,555	1,221
Gross Amounts Offset in the Balance Sheets	1,555	1,221
Net Amounts Presented in the Balance Sheets	0	0
Interest rate contracts
ASSETS
Gross Amounts Recognized	320	246
Gross Amounts Offset in the Balance Sheets	191	1,163
Net Amounts Presented in the Balance Sheets	129	(917)
LIABILITIES
Gross Amounts Recognized	191	1,163
Gross Amounts Offset in the Balance Sheets	191	1,163
Net Amounts Presented in the Balance Sheets	0	0
Credit contracts
ASSETS
Gross Amounts Recognized	35	20
Gross Amounts Offset in the Balance Sheets	3	15
Net Amounts Presented in the Balance Sheets	32	5
LIABILITIES
Gross Amounts Recognized	3	15
Gross Amounts Offset in the Balance Sheets	3	15
Net Amounts Presented in the Balance Sheets	0	0
Currency
ASSETS
Gross Amounts Recognized	19	52
Gross Amounts Offset in the Balance Sheets	10	6
Net Amounts Presented in the Balance Sheets	9	46
LIABILITIES
Gross Amounts Recognized	10	6
Gross Amounts Offset in the Balance Sheets	10	6
Net Amounts Presented in the Balance Sheets	0	0
Collateral
ASSETS
Gross Amounts Recognized	3	713
Gross Amounts Offset in the Balance Sheets	1,855	748
Net Amounts Presented in the Balance Sheets	(1,852)	(35)
LIABILITIES
Gross Amounts Recognized	1,855	748
Gross Amounts Offset in the Balance Sheets	1,855	748
Net Amounts Presented in the Balance Sheets	0	0
Margin
ASSETS
Gross Amounts Recognized	24	113
Gross Amounts Offset in the Balance Sheets	0	6
Net Amounts Presented in the Balance Sheets	24	107
LIABILITIES
Gross Amounts Recognized	0	6
Gross Amounts Offset in the Balance Sheets	0	6
Net Amounts Presented in the Balance Sheets	0	0
Derivatives Subject to an ISDA Master Agreements
ASSETS
Gross Amounts Recognized	3,740	3,272
Gross Amounts Offset in the Balance Sheets	3,614	3,159
Net Amounts Presented in the Balance Sheets	126	113
LIABILITIES
Gross Amounts Recognized	3,614	3,159
Gross Amounts Offset in the Balance Sheets	3,614	3,159
Net Amounts Presented in the Balance Sheets	0	0
Derivative investments
ASSETS
Gross Amounts Recognized	3,740	3,283
Gross Amounts Offset in the Balance Sheets	3,614	3,159
Net Amounts Presented in the Balance Sheets	126	124
LIABILITIES
Gross Amounts Recognized	3,614	3,159
Gross Amounts Offset in the Balance Sheets	3,614	3,159
Net Amounts Presented in the Balance Sheets	0	0
Other financial instruments
ASSETS
Gross Amounts Recognized	2,995	2,102
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	2,995	2,102
Other invested assets
ASSETS
Gross Amounts Recognized	6,735	5,385
Gross Amounts Offset in the Balance Sheets	3,614	3,159
Net Amounts Presented in the Balance Sheets	3,121	2,226
Derivatives not subject to an ISDA Master Agreements
ASSETS
Gross Amounts Recognized	0	11
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	0	11
LIABILITIES
Gross Amounts Recognized		0
Gross Amounts Offset in the Balance Sheets		0
Net Amounts Presented in the Balance Sheets		0
Other non-financial liabilities
LIABILITIES
Gross Amounts Recognized	2,663	2,108
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	2,663	2,108
Other liabilities
LIABILITIES
Gross Amounts Recognized	6,277	5,267
Gross Amounts Offset in the Balance Sheets	3,614	3,159
Net Amounts Presented in the Balance Sheets	2,663	2,108
Securities purchased under agreement to resell
ASSETS
Gross Amounts Recognized	0	0
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	0	0
Securities sold under agreement to repurchase(3)
Offsetting Assets [Line Items]
Securities sold under agreements to repurchase	1,882
LIABILITIES
Gross Amounts Recognized	1,882	1,992
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts Presented in the Balance Sheets	$ 1,882	$ 1,992

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