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DERIVATIVE INSTRUMENTS - Offsetting of Financial Liabilities and Derivative Liabilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Offsetting Liabilities [Line Items] |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 127 |  | $ 8 |
Gross amount of recognized derivative liabilities | (358) |  | (837) |
Gross amount of assets offset in balance sheet | 0 |  | 0 |
Net amount of derivative liabilities presented in balance sheet | (358) |  | (837) |
Financial instruments, amount not offset against derivative liabilities in balance sheet | 0 |  | 0 |
Derivative, Collateral, Right to Reclaim Securities and Cash | 127 | [1] | 8 | [2]
Derivative Liability, Fair Value, Amount Offset Against Collateral | (231) |  | (829) |
Foreign currency swaps |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities | (206) |  | (218) |
Gross amount of assets offset in balance sheet | 0 |  | 0 |
Net amount of derivative liabilities presented in balance sheet | (206) |  | (218) |
Financial instruments, amount not offset against derivative liabilities in balance sheet | 0 |  | 0 |
Derivative, Collateral, Right to Reclaim Cash | 2 |  | 1 |
Derivative Liability, Fair Value, Amount Offset Against Collateral | (204) |  | (217) |
Foreign currency forwards |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities | (59) |  | (582) |
Gross amount of assets offset in balance sheet | 0 |  | 0 |
Net amount of derivative liabilities presented in balance sheet | (59) |  | (582) |
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 | (59) |  | (582) |
Foreign currency options |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities | (23) |  | (1) |
Gross amount of assets offset in balance sheet | 0 |  | 0 |
Net amount of derivative liabilities presented in balance sheet | (23) |  | (1) |
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 | (23) |  | (1) |
Credit default swaps |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities | (2) |  | (4) |
Gross amount of assets offset in balance sheet | 0 |  | 0 |
Net amount of derivative liabilities presented in balance sheet | (2) |  | (4) |
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 | (2) |  | (4) |
Interest rate swaptions |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities | (61) |  | (32) |
Gross amount of assets offset in balance sheet | 0 |  | 0 |
Net amount of derivative liabilities presented in balance sheet | (61) |  | (32) |
Financial instruments, amount not offset against derivative liabilities in balance sheet | 0 |  | 0 |
Derivative, Collateral, Right to Reclaim Cash | 52 |  | 7 |
Derivative Liability, Fair Value, Amount Offset Against Collateral | (9) |  | (25) |
Futures |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amount of recognized derivative liabilities | (7) |  |  |
Gross amount of assets offset in balance sheet | 0 |  |  |
Net amount of derivative liabilities presented in balance sheet | (7) |  |  |
Financial instruments, amount not offset against derivative liabilities in balance sheet | 0 |  |  |
Derivative, Collateral, Right to Reclaim Cash | 73 |  |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral | 66 |  |  |
Offsetting liabilities |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized financial instruments | (3,671) |  | (6,657) |
Gross amounts offset in balance sheet | 0 |  | 0 |
Net amounts of liabilities presented in balance sheet | (3,671) |  | (6,657) |
Carrying value of financial instruments not offset in balance sheet | 3,234 |  | 5,656 |
Collateral not offset in balance sheet | 127 |  | 8 |
Financial instruments, amount offset against collateral | (310) |  | (993) |
Offsetting liabilities | Securities lending and similar arrangements |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross amounts of recognized financial instruments | (3,313) |  | (5,820) |
Gross amounts offset in balance sheet | 0 |  | 0 |
Net amounts of liabilities presented in balance sheet | (3,313) |  | (5,820) |
Carrying value of financial instruments not offset in balance sheet | 3,234 |  | 5,656 |
Collateral not offset in balance sheet | 0 |  | 0 |
Financial instruments, amount offset against collateral | (79) |  | (164) |
Japanese Government Bonds |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Collateral Already Posted, Aggregate Fair Value | 52 |  | 7 |
Cash |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 75 |  | $ 1 |
[1] | Consists of $52 of pledged JGBs and $75 of cash.
[2] | Consists of $7 of pledged JGBs and $1 of cash.

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