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INVESTMENTS - Fair Value and Gross Unrealized Losses for Securities That Have Been in Continuous Unrealized Loss Position (Detail) - Fixed maturity securities - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 7,190 | $ 24,484
Total Unrealized Losses | 385 | 1,760
Less Than 12 months Fair Value | 3,423 | 16,389
Less Than 12 months Unrealized Losses | 178 | 985
12 months or longer Fair Value | 3,767 | 8,095
12 months or longer Unrealized Losses | 207 | 775
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 3,604
Total Unrealized Losses |  | 140
Less Than 12 months Fair Value |  | 3,604
Less Than 12 months Unrealized Losses |  | 140
12 months or longer Fair Value |  | 0
12 months or longer Unrealized Losses |  | 0
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 80 | 148
Total Unrealized Losses | 3 | 9
Less Than 12 months Fair Value | 80 | 148
Less Than 12 months Unrealized Losses | 3 | 9
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 604
Total Unrealized Losses |  | 12
Less Than 12 months Fair Value |  | 604
Less Than 12 months Unrealized Losses |  | 12
12 months or longer Fair Value |  | 0
12 months or longer Unrealized Losses |  | 0
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,828 | 3,057
Total Unrealized Losses | 89 | 258
Less Than 12 months Fair Value | 1,828 | 3,057
Less Than 12 months Unrealized Losses | 89 | 258
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 636 | 1,306
Total Unrealized Losses | 31 | 82
Less Than 12 months Fair Value | 636 | 1,306
Less Than 12 months Unrealized Losses | 31 | 82
12 months or longer Fair Value | 0 | 0
12 months or longer Unrealized Losses | 0 | 0
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 67
Total Unrealized Losses |  | 1
Less Than 12 months Fair Value |  | 67
Less Than 12 months Unrealized Losses |  | 1
12 months or longer Fair Value |  | 0
12 months or longer Unrealized Losses |  | 0
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 515
Total Unrealized Losses |  | 8
Less Than 12 months Fair Value |  | 515
Less Than 12 months Unrealized Losses |  | 8
12 months or longer Fair Value |  | 0
12 months or longer Unrealized Losses |  | 0
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 74
Total Unrealized Losses |  | 1
Less Than 12 months Fair Value |  | 74
Less Than 12 months Unrealized Losses |  | 1
12 months or longer Fair Value |  | 0
12 months or longer Unrealized Losses |  | 0
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 306 | 1,585
Total Unrealized Losses | 10 | 105
Less Than 12 months Fair Value | 69 | 892
Less Than 12 months Unrealized Losses | 2 | 48
12 months or longer Fair Value | 237 | 693
12 months or longer Unrealized Losses | 8 | 57
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 79 | 625
Total Unrealized Losses | 4 | 35
Less Than 12 months Fair Value | 18 | 340
Less Than 12 months Unrealized Losses | 0 | 19
12 months or longer Fair Value | 61 | 285
12 months or longer Unrealized Losses | 4 | 16
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 4,261 | 12,899
Total Unrealized Losses | 248 | 1,109
Less Than 12 months Fair Value | 792 | 5,782
Less Than 12 months Unrealized Losses | 53 | 407
12 months or longer Fair Value | 3,469 | 7,117
12 months or longer Unrealized Losses | $ 195 | $ 702

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