DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	$ 598		$ 345
Gross amount of liabilities offset in balance sheet	0		0
Net amount of derivative assets presented in balance sheet	598		345
Financial instruments, amount not offset against derivative assets in balance sheet	0		0
Derivative, collateral, obligation to return cash	(104)	[1]	0
Derivative asset, fair value, amount offset against collateral	494		345
Interest rate swaps
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	1		32
Gross amount of liabilities offset in balance sheet	0		0
Net amount of derivative assets presented in balance sheet	1		32
Financial instruments, amount not offset against derivative assets in balance sheet	0		0
Derivative, collateral, obligation to return cash	0		0
Derivative asset, fair value, amount offset against collateral	1		32
Foreign currency swaps
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	426		311
Gross amount of liabilities offset in balance sheet	0		0
Net amount of derivative assets presented in balance sheet	426		311
Financial instruments, amount not offset against derivative assets in balance sheet	0		0
Derivative, collateral, obligation to return cash	(104)		0
Derivative asset, fair value, amount offset against collateral	322		311
Foreign currency forwards
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	129
Gross amount of liabilities offset in balance sheet	0
Net amount of derivative assets presented in balance sheet	129
Financial instruments, amount not offset against derivative assets in balance sheet	0
Derivative, collateral, obligation to return cash	0
Derivative asset, fair value, amount offset against collateral	129
Foreign currency options
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	2
Gross amount of liabilities offset in balance sheet	0
Net amount of derivative assets presented in balance sheet	2
Financial instruments, amount not offset against derivative assets in balance sheet	0
Derivative, collateral, obligation to return cash	0
Derivative asset, fair value, amount offset against collateral	2
Credit default swaps
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	2		2
Gross amount of liabilities offset in balance sheet	0		0
Net amount of derivative assets presented in balance sheet	2		2
Financial instruments, amount not offset against derivative assets in balance sheet	0		0
Derivative, collateral, obligation to return cash	0		0
Derivative asset, fair value, amount offset against collateral	2		2
Interest rate swaptions
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	38
Gross amount of liabilities offset in balance sheet	0
Net amount of derivative assets presented in balance sheet	38
Financial instruments, amount not offset against derivative assets in balance sheet	0
Derivative, collateral, obligation to return cash	0
Derivative asset, fair value, amount offset against collateral	38
Offsetting assets
Offsetting Assets [Line Items]
Gross amounts of recognized financial instruments	1,211		6,467
Gross amounts offset in balance sheet	0		0
Net amounts of assets presented in balance sheet	1,211		6,467
Carrying value of financial instruments not offset in balance sheet	0		0
Collateral not offset in balance sheet	(717)		(6,122)
Financial instruments, amount offset against collateral	494		345
Offsetting assets | Securities lending and similar arrangements
Offsetting Assets [Line Items]
Gross amounts of recognized financial instruments	613		6,122
Gross amounts offset in balance sheet	0		0
Net amounts of assets presented in balance sheet	613		6,122
Carrying value of financial instruments not offset in balance sheet	0		0
Collateral not offset in balance sheet	(613)		(6,122)
Financial instruments, amount offset against collateral	$ 0		$ 0

[1] Consists entirely of cash.