DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	$ (240)		$ (837)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(240)		(837)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Securities and Cash	62	[1]	8	[2]
Derivative Liability, Fair Value, Amount Offset Against Collateral	(178)		(829)
Derivative, Collateral, Right to Reclaim Securities	55		7
Derivative, Collateral, Right to Reclaim Cash	7		1
Foreign currency swaps
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(156)		(218)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(156)		(218)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Securities and Cash	5		1
Derivative Liability, Fair Value, Amount Offset Against Collateral	(151)		(217)
Foreign currency forwards
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities			(582)
Gross amount of assets offset in balance sheet			0
Net amount of derivative liabilities presented in balance sheet			(582)
Financial instruments, amount not offset against derivative liabilities in balance sheet			0
Derivative, Collateral, Right to Reclaim Securities and Cash			0
Derivative Liability, Fair Value, Amount Offset Against Collateral			(582)
Foreign currency options
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(7)		(1)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(7)		(1)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Securities and Cash	2		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(5)		(1)
Credit default swaps
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 Securities and Cash			0
Derivative Liability, Fair Value, Amount Offset Against Collateral			(4)
Interest rate swap
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(1)
Gross amount of assets offset in balance sheet	0
Net amount of derivative liabilities presented in balance sheet	(1)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0
Derivative, Collateral, Right to Reclaim Securities and Cash	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(1)
Interest rate swaptions
Offsetting Liabilities [Line Items]
Gross amount of recognized derivative liabilities	(76)		(32)
Gross amount of assets offset in balance sheet	0		0
Net amount of derivative liabilities presented in balance sheet	(76)		(32)
Financial instruments, amount not offset against derivative liabilities in balance sheet	0		0
Derivative, Collateral, Right to Reclaim Securities and Cash	55		7
Derivative Liability, Fair Value, Amount Offset Against Collateral	(21)		(25)
Offsetting liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized financial instruments	(3,212)		(6,657)
Gross amounts offset in balance sheet	0		0
Net amounts of liabilities presented in balance sheet	(3,212)		(6,657)
Carrying value of financial instruments not offset in balance sheet	2,907		5,656
Collateral not offset in balance sheet	62		8
Financial instruments, amount offset against collateral	(243)		(993)
Offsetting liabilities | Securities lending and similar arrangements
Offsetting Liabilities [Line Items]
Gross amounts of recognized financial instruments	(2,972)		(5,820)
Gross amounts offset in balance sheet	0		0
Net amounts of liabilities presented in balance sheet	(2,972)		(5,820)
Carrying value of financial instruments not offset in balance sheet	2,907		5,656
Collateral not offset in balance sheet	0		0
Financial instruments, amount offset against collateral	$ (65)		$ (164)

[1] Consists of $55 of pledged JGBs and $7 of cash.

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