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DERIVATIVE INSTRUMENTS - Offsetting of Financial Assets and Derivative Assets (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets | $ 523 |  | $ 488 |
Gross amount of liabilities offset in balance sheet | 0 |  | 0 |
Net amount of derivative assets presented in balance sheet | 523 |  | 488 |
Financial instruments, amount not offset against derivative assets in balance sheet | 0 |  | 0 |
Derivative, collateral, obligation to return cash | (263) | [1] | (295) | [1]
Derivative asset, fair value, amount offset against collateral | 260 |  | 193 |
Foreign currency swaps |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets | 426 |  | 445 |
Gross amount of liabilities offset in balance sheet | 0 |  | 0 |
Net amount of derivative assets presented in balance sheet | 426 |  | 445 |
Financial instruments, amount not offset against derivative assets in balance sheet | 0 |  | 0 |
Derivative, collateral, obligation to return cash | (253) |  | (276) |
Derivative asset, fair value, amount offset against collateral | 173 |  | 169 |
Foreign currency forwards |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets | 58 |  | 17 |
Gross amount of liabilities offset in balance sheet | 0 |  | 0 |
Net amount of derivative assets presented in balance sheet | 58 |  | 17 |
Financial instruments, amount not offset against derivative assets in balance sheet | 0 |  | 0 |
Derivative, collateral, obligation to return cash | (9) |  | (16) |
Derivative asset, fair value, amount offset against collateral | 49 |  | 1 |
Foreign currency options |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets | 26 |  | 4 |
Gross amount of liabilities offset in balance sheet | 0 |  | 0 |
Net amount of derivative assets presented in balance sheet | 26 |  | 4 |
Financial instruments, amount not offset against derivative assets in balance sheet | 0 |  | 0 |
Derivative, collateral, obligation to return cash | (1) |  | (3) |
Derivative asset, fair value, amount offset against collateral | 25 |  | 1 |
Credit default swaps |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets | 1 |  | 1 |
Gross amount of liabilities offset in balance sheet | 0 |  | 0 |
Net amount of derivative assets presented in balance sheet | 1 |  | 1 |
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 |  | 1 |
Interest rate swaptions |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets | 12 |  | 20 |
Gross amount of liabilities offset in balance sheet | 0 |  | 0 |
Net amount of derivative assets presented in balance sheet | 12 |  | 20 |
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 | 12 |  | 20 |
Interest rate swaps |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amount of recognized derivative assets |  |  | 1 |
Gross amount of liabilities offset in balance sheet |  |  | 0 |
Net amount of derivative assets presented in balance sheet |  |  | 1 |
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 |  |  | 1 |
Offsetting assets |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amounts of recognized financial instruments | 3,757 |  | 6,144 |
Gross amounts offset in balance sheet | 0 |  | 0 |
Net amounts of assets presented in balance sheet | 3,757 |  | 6,144 |
Carrying value of financial instruments not offset in balance sheet | 0 |  | 0 |
Collateral not offset in balance sheet | (3,497) |  | (5,951) |
Financial instruments, amount offset against collateral | 260 |  | 193 |
Offsetting assets | Securities lending and similar arrangements |  |  |  |
Offsetting Assets [Line Items] |  |  |  |
Gross amounts of recognized financial instruments | 3,234 |  | 5,656 |
Gross amounts offset in balance sheet | 0 |  | 0 |
Net amounts of assets presented in balance sheet | 3,234 |  | 5,656 |
Carrying value of financial instruments not offset in balance sheet | 0 |  | 0 |
Collateral not offset in balance sheet | (3,234) |  | (5,656) |
Financial instruments, amount offset against collateral | $ 0 |  | $ 0 |
[1] | Consists entirely of cash.

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