DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Offsetting Liabilities [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 88		$ 0
Gross amount of recognized derivative liabilities	(435)		(934)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(435)		(934)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Securities and Cash	88	[1]	0	[1]
Derivative Liability, Fair Value, Amount Offset Against Collateral	(347)		(934)
Interest rate swaps
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(1)		(3)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(1)		(3)
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	(1)		(3)
Foreign currency swaps
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(300)		(329)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(300)		(329)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	7		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(293)		(329)
Foreign currency forwards
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(13)		(535)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(13)		(535)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Cash	9		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(4)		(535)
Foreign currency options
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(4)
Gross amount of assets offset in balance sheet	0
Net amount of derivative liabilities presented in balance sheet	(4)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0
Derivative, Collateral, Right to Reclaim Cash	2
Derivative Liability, Fair Value, Amount Offset Against Collateral	(2)
Credit default swaps
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(9)		(67)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(9)		(67)
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	(9)		(67)
Interest rate swaptions
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(108)
Gross amount of assets offset in balance sheet	0
Net amount of derivative liabilities presented in balance sheet	(108)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0
Derivative, Collateral, Right to Reclaim Securities	70
Derivative Liability, Fair Value, Amount Offset Against Collateral	(38)
Offsetting liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized financial instruments	(1,063)		(7,211)
Gross amounts offset in balance sheet	0		0
Net amounts of liabilities presented in balance sheet	(1,063)		(7,211)
Carrying value of financial instruments not offset in balance sheet	613		6,122
Collateral not offset in balance sheet	88		0
Financial instruments, amount offset against collateral	(362)		(1,089)
Offsetting liabilities | Securities lending and similar arrangements
Offsetting Liabilities [Line Items]
Gross amounts of recognized financial instruments	(628)		(6,277)
Gross amounts offset in balance sheet	0		0
Net amounts of liabilities presented in balance sheet	(628)		(6,277)
Carrying value of financial instruments not offset in balance sheet	613		6,122
Collateral not offset in balance sheet	0		0
Financial instruments, amount offset against collateral	(15)		(155)
Japanese Government Bonds
Offsetting Liabilities [Line Items]
Collateral Already Posted, Aggregate Fair Value	70
Cash
Offsetting Liabilities [Line Items]
Collateral Already Posted, Aggregate Fair Value	$ 18

[1] Consists of $70 of pledged JGBs and $18 of cash.