DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Offsetting Liabilities [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 127		$ 8
Gross amount of recognized derivative liabilities	(358)		(837)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(358)		(837)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Securities and Cash	127	[1]	8	[2]
Derivative Liability, Fair Value, Amount Offset Against Collateral	(231)		(829)
Foreign currency swaps
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(206)		(218)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(206)		(218)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	2		1
Derivative Liability, Fair Value, Amount Offset Against Collateral	(204)		(217)
Foreign currency forwards
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(59)		(582)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(59)		(582)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(59)		(582)
Foreign currency options
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(23)		(1)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(23)		(1)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(23)		(1)
Credit default swaps
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(2)		(4)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(2)		(4)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(2)		(4)
Interest rate swaptions
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(61)		(32)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(61)		(32)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	52		7
Derivative Liability, Fair Value, Amount Offset Against Collateral	(9)		(25)
Futures
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(7)
Gross amount of assets offset in balance sheet	0
Net amount of derivative liabilities presented in balance sheet	(7)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0
Derivative, Collateral, Right to Reclaim Cash	73
Derivative Liability, Fair Value, Amount Offset Against Collateral	66
Offsetting liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized financial instruments	(3,671)		(6,657)
Gross amounts offset in balance sheet	0		0
Net amounts of liabilities presented in balance sheet	(3,671)		(6,657)
Carrying value of financial instruments not offset in balance sheet	3,234		5,656
Collateral not offset in balance sheet	127		8
Financial instruments, amount offset against collateral	(310)		(993)
Offsetting liabilities | Securities lending and similar arrangements
Offsetting Liabilities [Line Items]
Gross amounts of recognized financial instruments	(3,313)		(5,820)
Gross amounts offset in balance sheet	0		0
Net amounts of liabilities presented in balance sheet	(3,313)		(5,820)
Carrying value of financial instruments not offset in balance sheet	3,234		5,656
Collateral not offset in balance sheet	0		0
Financial instruments, amount offset against collateral	(79)		(164)
Japanese Government Bonds
Offsetting Liabilities [Line Items]
Collateral Already Posted, Aggregate Fair Value	52		7
Cash
Offsetting Liabilities [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 75		$ 1

[1] Consists of $52 of pledged JGBs and $75 of cash.

[2] Consists of $7 of pledged JGBs and $1 of cash.