DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	$ 620	$ 345
Gross amount of liabilities offset in balance sheet	0	0
Net amount of derivative assets presented in balance sheet	620	345
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	620	345
Interest rate swaps
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	22	32
Gross amount of liabilities offset in balance sheet	0	0
Net amount of derivative assets presented in balance sheet	22	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	22	32
Foreign currency swaps
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	381	311
Gross amount of liabilities offset in balance sheet	0	0
Net amount of derivative assets presented in balance sheet	381	311
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	381	311
Foreign currency forwards
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	178
Gross amount of liabilities offset in balance sheet	0
Net amount of derivative assets presented in balance sheet	178
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	178
Foreign currency options
Offsetting Assets [Line Items]
Gross amount of recognized derivative assets	37
Gross amount of liabilities offset in balance sheet	0
Net amount of derivative assets presented in balance sheet	37
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	37
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
Offsetting assets
Offsetting Assets [Line Items]
Gross amounts of recognized financial instruments	2,090	6,467
Gross amounts offset in balance sheet	0	0
Net amounts of assets presented in balance sheet	2,090	6,467
Carrying value of financial instruments not offset in balance sheet	0	0
Cash collateral not offset in balance sheet	(1,470)	(6,122)
Financial instruments, amount offset against collateral	620	345
Offsetting assets | Securities lending and similar arrangements
Offsetting Assets [Line Items]
Gross amounts of recognized financial instruments	1,470	6,122
Gross amounts offset in balance sheet	0	0
Net amounts of assets presented in balance sheet	1,470	6,122
Carrying value of financial instruments not offset in balance sheet	0	0
Cash collateral not offset in balance sheet	(1,470)	(6,122)
Financial instruments, amount offset against collateral	$ 0	$ 0