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FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period |  | $ 648 |  | $ 453
Realized investment gains (losses) included in earnings |  | (34) |  | 52
Unrealized gains (losses) included in other comprehensive income (loss) |  | 12 |  | 6
Purchases |  | 247 |  | 127
Issuances |  | 0 |  | 0
Sales |  | (41) |  | 0
Settlements |  | (6) |  | (6)
Transfers into Level 3 |  | 142 |  | 16
Transfers out of Level 3 |  | (158) |  | 0
Balance, end of period |  | 810 |  | 648
Change in unrealized gains (losses) still held |  | (33) |  | 52
Foreign currency swaps |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance, beginning of period | [1] | 80 |  | 22
Realized gains (losses) included in earnings | [1] | (33) |  | 54
Unrealized gains (losses) included in other comprehensive income (loss) | [1] | (4) |  | 4
Purchases | [1] | 0 |  | 0
Issuances | [1] | 0 |  | 0
Sales | [1] | 0 |  | 0
Settlements | [1] | 0 |  | 0
Transfers into Level 3 | [1] | 0 |  | 0
Transfers out of Level 3 | [1] | 0 |  | 0
Balance, end of period | [1] | 43 |  | 80
Change in unrealized gains (losses) still held | [1] | (33) |  | 54
Credit default swaps |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance, beginning of period | [1] | 0 |  | 1
Realized gains (losses) included in earnings | [1] | 0 |  | (1)
Unrealized gains (losses) included in other comprehensive income (loss) | [1] | 0 |  | 0
Purchases | [1] | 0 |  | 0
Issuances | [1] | 0 |  | 0
Sales | [1] | 0 |  | 0
Settlements | [1] | 0 |  | 0
Transfers into Level 3 | [1] | 0 |  | 0
Transfers out of Level 3 | [1] | 0 |  | 0
Balance, end of period | [1] | 0 |  | 0
Change in unrealized gains (losses) still held | [1] | 0 |  | (1)
Fixed maturity securities | Mortgage- and asset-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period |  | 177 |  | 175
Realized investment gains (losses) included in earnings |  | 0 |  | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 1 |  | 2
Purchases |  | 0 |  | 0
Issuances |  | 0 |  | 0
Sales |  | 0 |  | 0
Settlements |  | 0 |  | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Balance, end of period |  | 178 |  | 177
Change in unrealized gains (losses) still held |  | 0 |  | 0
Fixed maturity securities | Public utilities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period |  | 109 |  | 68
Realized investment gains (losses) included in earnings |  | 0 |  | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 6 |  | 1
Purchases |  | 48 |  | 40
Issuances |  | 0 |  | 0
Sales |  | (24) |  | 0
Settlements |  | (6) |  | 0
Transfers into Level 3 |  | 116 | [2] | 0
Transfers out of Level 3 |  | (25) | [2] | 0
Balance, end of period |  | 224 |  | 109
Change in unrealized gains (losses) still held |  | 0 |  | 0
Fixed maturity securities | Banks/financial institutions |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period |  | 23 |  | 25
Realized investment gains (losses) included in earnings |  | 0 |  | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 1 |  | (2)
Purchases |  | 0 |  | 0
Issuances |  | 0 |  | 0
Sales |  | 0 |  | 0
Settlements |  | 0 |  | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | (1) |  | 0
Balance, end of period |  | 23 |  | 23
Change in unrealized gains (losses) still held |  | 0 |  | 0
Fixed maturity securities | Other corporate |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance, beginning of period |  | 213 |  | 146
Realized investment gains (losses) included in earnings |  | (1) |  | 0
Unrealized gains (losses) included in other comprehensive income (loss) |  | 8 |  | 1
Purchases |  | 165 |  | 56
Issuances |  | 0 |  | 0
Sales |  | (17) |  | 0
Settlements |  | 0 |  | (6)
Transfers into Level 3 |  | 26 | [2] | 16
Transfers out of Level 3 |  | (132) | [2],[3] | 0
Balance, end of period |  | 262 |  | 213
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 |  | 46 |  | 16
Realized investment gains (losses) included in earnings |  | 0 |  | (1)
Unrealized gains (losses) included in other comprehensive income (loss) |  | 0 |  | 0
Purchases |  | 34 |  | 31
Issuances |  | 0 |  | 0
Sales |  | 0 |  | 0
Settlements |  | 0 |  | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  | 0 |  | 0
Balance, end of period |  | 80 |  | 46
Change in unrealized gains (losses) still held |  | $ 0 |  | $ (1)
[1] | Derivative assets and liabilities are presented net
[2] | Transfer due to sector classification change
[3] | Transfer due to availability of observable market inputs

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