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FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | $ 341 | $ 20 | $ 58 | $ 189
Realized investment gains (losses) included in earnings |  | (16) | (14) | 252 | (38)
Unrealized gains (losses) included in other comprehensive income (loss) |  | 1 | 6 | 32 | (6)
Purchases |  | 0 | 0 | 0 | 0
Issuances |  | 0 | 0 | 0 | 0
Sales |  | 0 | 0 | 0 | (147)
Settlements |  | (13) | 0 | (29) | 14
Transfers into Level 3 |  | 0 | 0 | 0 | 0
Transfers out of Level 3 |  | 0 | 0 | 0 | 0
Balance, end of period |  | 313 | 12 | 313 | 12
Change in unrealized gains (losses) still held |  | (16) | (15) | 252 | (39)
Foreign currency swaps |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | 59 | (223) | (192) | (212)
Realized gains or losses included in earnings | [1] | (18) | (13) | 250 | (38)
Unrealized gains or losses included in other comprehensive income (loss) | [1] | 0 | (1) | (16) | (3)
Purchases | [1] | 0 | 0 | 0 | 0
Issuances | [1] | 0 | 0 | 0 | 0
Sales | [1] | 0 | 0 | 0 | 0
Settlements | [1] | 0 | 0 | (1) | 16
Transfers into Level 3 | [1] | 0 | 0 | 0 | 0
Transfers out of Level 3 | [1] | 0 | 0 | 0 | 0
Balance, end of period | [1] | 41 | (237) | 41 | (237)
Changes in unrealized gain (losses) still held | [1] | (18) | (14) | 250 | (39)
Credit default swaps |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |  |
Balance, beginning of period | [1] | 1 | 1 | 1 | 0
Realized gains or losses included in earnings | [1] | 2 | (1) | 2 | 0
Unrealized gains or losses included in other comprehensive income (loss) | [1] | 0 | 0 | 0 | 0
Purchases | [1] | 0 | 0 | 0 | 0
Issuances | [1] | 0 | 0 | 0 | 0
Sales | [1] | 0 | 0 | 0 | 0
Settlements | [1] | 0 | 0 | 0 | 0
Transfers into Level 3 | [1] | 0 | 0 | 0 | 0
Transfers out of Level 3 | [1] | 0 | 0 | 0 | 0
Balance, end of period | [1] | 3 | 0 | 3 | 0
Changes in unrealized gain (losses) still held | [1] | 2 | (1) | 2 | 0
Fixed maturities | Mortgage- and asset-backed securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | 252 | 214 | 220 | 223
Realized investment gains (losses) included in earnings |  | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 1 | 6 | 48 | (1)
Purchases |  | 0 | 0 | 0 | 0
Issuances |  | 0 | 0 | 0 | 0
Sales |  | 0 | 0 | 0 | 0
Settlements |  | (13) | 0 | (28) | (2)
Transfers into Level 3 |  | 0 | 0 | 0 | 0
Transfers out of Level 3 |  | 0 | 0 | 0 | 0
Balance, end of period |  | 240 | 220 | 240 | 220
Change in unrealized gains (losses) still held |  | 0 | 0 | 0 | 0
Fixed maturities | Banks/financial institutions |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | 26 | 25 | 26 | 26
Realized investment gains (losses) included in earnings |  | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 1 | 0 | 0
Purchases |  | 0 | 0 | 0 | 0
Issuances |  | 0 | 0 | 0 | 0
Sales |  | 0 | 0 | 0 | 0
Settlements |  | 0 | 0 | 0 | 0
Transfers into Level 3 |  | 0 | 0 | 0 | 0
Transfers out of Level 3 |  | 0 | 0 | 0 | 0
Balance, end of period |  | 26 | 26 | 26 | 26
Change in unrealized gains (losses) still held |  | 0 | 0 | 0 | 0
Perpetual securities | Banks/financial institutions |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance, beginning of period |  |  |  | 0 | 149
Realized investment gains (losses) included in earnings |  |  |  | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  |  |  | 0 | (2)
Purchases |  |  |  | 0 | 0
Issuances |  |  |  | 0 | 0
Sales |  |  |  | 0 | (147)
Settlements |  |  |  | 0 | 0
Transfers into Level 3 |  |  |  | 0 | 0
Transfers out of Level 3 |  |  |  | 0 | 0
Balance, end of period |  | 0 | 0 | 0 | 0
Change in unrealized gains (losses) still held |  |  |  | 0 | 0
Equity securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance, beginning of period |  | 3 | 3 | 3 | 3
Realized investment gains (losses) included in earnings |  | 0 | 0 | 0 | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 0 | 0 | 0 | 0
Purchases |  | 0 | 0 | 0 | 0
Issuances |  | 0 | 0 | 0 | 0
Sales |  | 0 | 0 | 0 | 0
Settlements |  | 0 | 0 | 0 | 0
Transfers into Level 3 |  | 0 | 0 | 0 | 0
Transfers out of Level 3 |  | 0 | 0 | 0 | 0
Balance, end of period |  | 3 | 3 | 3 | 3
Change in unrealized gains (losses) still held |  | $ 0 | $ 0 | $ 0 | $ 0
[1] | Derivative assets and liabilities are presented net

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