DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Offsetting Assets [Line Items]
Derivative assets carrying value	$ 430	$ 345
Securities lending carrying value	202	6,122
Securities lending cash collateral received	(207)	(6,277)
Securities lending net	(5)	(155)
Derivative assets and financial assets carrying value	474	6,276
Derivative assets and financial assets cash collateral received	(207)	(6,277)
Derivative assets and financial assets net	267	(1)
Investments Other Than Consolidated Variable Interest Entities
Offsetting Assets [Line Items]
Derivative assets carrying value	272	154
Derivative assets cash collateral received	0	0
Derivative assets net	272	154
Investments Other Than Consolidated Variable Interest Entities | Foreign currency swaps
Offsetting Assets [Line Items]
Derivative assets carrying value	251	154
Derivative assets cash collateral received	0	0
Derivative assets net	251	154
Investments Other Than Consolidated Variable Interest Entities | Foreign currency forwards
Offsetting Assets [Line Items]
Derivative assets carrying value	19
Derivative assets cash collateral received	0
Derivative assets net	19
Investments Other Than Consolidated Variable Interest Entities | Foreign currency options
Offsetting Assets [Line Items]
Derivative assets carrying value	2
Derivative assets cash collateral received	0
Derivative assets net	$ 2