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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Signficant Accounting Policies - Additional Information (Detail) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2021 USD ($) | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of reportable insurance business segments | segment |  | 2 |  |  |
Goodwill |  | $ 265 | $ 265 |  |
Stockholders' Equity Attributable to Parent |  | 21,985 | 20,140 | $ 17,031 | $ 33,559
Accumulated other comprehensive income (loss) |  | (5,520) | (6,429) | (8,411) | 8,934
Retained earnings |  | 47,993 | 44,367 |  |
Amortized Cost |  | 70,689 | 75,469 |  |
Held-to-maturity securities |  | (17,824) | (19,063) |  |
Accounting Standards Update 2018-12 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Capped transition date NPR | 100.00% |  |  |  |
Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ (18,894) |  |  |  | (18,894)
Accumulated other comprehensive income (loss) | (18,600) |  |  |  | (18,570)
Retained earnings | (300) |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | (5,520) | (6,429) | (8,411) | 8,934
Accumulated other comprehensive income (loss) | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | (18,570) |  |  |  | (18,570)
Retained earnings |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent |  | $ 47,993 | $ 44,367 | $ 40,963 | 37,984
Retained earnings | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ (324) |  |  |  | $ (324)

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