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Fair Value of Financial Instruments - Changes to Fair Value of Financial Instruments Level 3 (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Liabilities, Fair Value Disclosure [Abstract] |  |
Balance at End of Period | $ 4,258 |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Recognized gains and losses, net | Recognized gains and losses, net
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Unrealized gain (loss) on investments and other financial instruments, net of adjustments to intangible assets and unearned revenue (excluding investments in unconsolidated affiliates) | Unrealized gain (loss) on investments and other financial instruments, net of adjustments to intangible assets and unearned revenue (excluding investments in unconsolidated affiliates)
Level 3 |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | $ 8,286 | $ 5,641
Balance at End of Period | 9,677 | 8,286
Liabilities, Fair Value Disclosure [Abstract] |  |
Balance at Beginning of Period | 3,397 | 4,352
Balance at End of Period | 4,661 | 3,397
FIA embedded derivatives, included in contractholder funds |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Balance at Beginning of Period | 3,115 | 3,883
Liabilities, Total Gains (Losses) Included in Earnings | 257 | (1,382)
Liabilities, Total Gains (Losses) Included in AOCI | 0 | 0
Liabilities, Purchases | 1,049 | 768
Liabilities, Sales | 0 | 0
Liabilities, Settlements | (163) | (154)
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 4,258 | 3,115
Change in Unrealized Incl in OCI | 0 | 0
Derivative investments |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 0 |
Assets, Total Gains (Losses) Included in Earnings | 57 |
Assets, Total Gains (Losses) Included in AOCI | 0 |
Assets, Purchases | 0 |
Assets, Sales | 0 |
Assets, Settlements | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 |
Balance at End of Period | 57 | 0
Change in Unrealized Included in OCI | 0 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 6,263 | 3,959
Assets, Total Gains (Losses) Included in Earnings | (53) | (6)
Assets, Total Gains (Losses) Included in AOCI | 186 | (393)
Assets, Purchases | 1,830 | 3,269
Assets, Sales | (125) | (39)
Assets, Settlements | (738) | (541)
Assets, Net transfer In (Out) of Level 3 | (241) | 14
Balance at End of Period | 7,122 | 6,263
Change in Unrealized Included in OCI | 185 | (426)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 37 | 35
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 2 | (5)
Assets, Purchases | 22 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | (43) | 7
Balance at End of Period | 18 | 37
Change in Unrealized Included in OCI | 2 | (4)
Corporates |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 1,440 | 1,135
Assets, Total Gains (Losses) Included in Earnings | (2) | 1
Assets, Total Gains (Losses) Included in AOCI | (21) | (187)
Assets, Purchases | 654 | 714
Assets, Sales | (1) | (20)
Assets, Settlements | (94) | (215)
Assets, Net transfer In (Out) of Level 3 | 3 | 12
Balance at End of Period | 1,979 | 1,440
Change in Unrealized Included in OCI | (20) | (188)
Hybrids |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 0 | 0
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | 0
Assets, Purchases | 0 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 0 | 0
Change in Unrealized Included in OCI | 0 | 0
Municipals |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 29 | 43
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 20 | (14)
Assets, Purchases | 0 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 49 | 29
Change in Unrealized Included in OCI | 20 | (13)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 302 | 0
Assets, Total Gains (Losses) Included in Earnings | 1 | 0
Assets, Total Gains (Losses) Included in AOCI | 7 | 0
Assets, Purchases | 32 | 316
Assets, Sales | 0 | 0
Assets, Settlements | (9) | 0
Assets, Net transfer In (Out) of Level 3 | (330) | (14)
Balance at End of Period | 3 | 302
Change in Unrealized Included in OCI | 7 | 0
Foreign Governments |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 16 | 18
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | (2)
Assets, Purchases | 0 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 16 | 16
Change in Unrealized Included in OCI | 0 | (1)
Investment in unconsolidated affiliates |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 23 | 21
Assets, Total Gains (Losses) Included in Earnings | 13 | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | 2
Assets, Purchases | 249 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 285 | 23
Change in Unrealized Included in OCI | 0 | 2
Short-term |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 0 | 321
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | (1)
Assets, Purchases | 204 | 20
Assets, Sales | (19) | 0
Assets, Settlements | (185) | 0
Assets, Net transfer In (Out) of Level 3 | 0 | (340)
Balance at End of Period | 0 | 0
Change in Unrealized Included in OCI | 0 | (1)
Preferred securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 1 | 2
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | (1)
Assets, Purchases | 0 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 7 | 0
Balance at End of Period | 8 | 1
Change in Unrealized Included in OCI | 1 | (1)
Equity securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 10 | 9
Assets, Total Gains (Losses) Included in Earnings | 1 | 0
Assets, Total Gains (Losses) Included in AOCI | 1 | 0
Assets, Purchases | 0 | 2
Assets, Sales | 0 | (1)
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 3 | 0
Balance at End of Period | 15 | 10
Change in Unrealized Included in OCI | 0 | 0
Available-for-sale embedded derivative |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 23 | 34
Assets, Total Gains (Losses) Included in Earnings | 0 | (11)
Assets, Total Gains (Losses) Included in AOCI | 4 | 0
Assets, Purchases | 0 | 0
Assets, Sales | 0 | 0
Assets, Settlements | 0 | 0
Assets, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 27 | 23
Change in Unrealized Included in OCI | 4 | 0
Credit linked note |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 15 | 23
Assets, Total Gains (Losses) Included in Earnings | 0 | (1)
Assets, Total Gains (Losses) Included in AOCI | 0 | (1)
Assets, Purchases | 0 | 0
Assets, Sales | 0 | (2)
Assets, Settlements | (5) | (4)
Assets, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period | 10 | 15
Change in Unrealized Included in OCI | 0 | 0
Secured borrowing receivable |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 10 | 0
Assets, Total Gains (Losses) Included in Earnings | 0 | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | 0
Assets, Purchases | 0 | 0
Assets, Sales | 0 | 0
Assets, Settlements | (10) | 0
Assets, Net transfer In (Out) of Level 3 | 0 | 10
Balance at End of Period | 0 | 10
Change in Unrealized Included in OCI | 0 | 0
Subtotal Level 3 assets at fair value |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 8,169 | 5,600
Assets, Total Gains (Losses) Included in Earnings |  | (17)
Assets, Total Gains (Losses) Included in AOCI |  | (602)
Assets, Purchases |  | 4,321
Assets, Sales |  | (62)
Assets, Settlements |  | (760)
Assets, Net transfer In (Out) of Level 3 |  | (311)
Balance at End of Period |  | 8,169
Change in Unrealized Included in OCI |  | (632)
Subtotal Level 3 assets at fair value | Level 3 |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 8,169 |
Assets, Total Gains (Losses) Included in Earnings | 17 |
Assets, Total Gains (Losses) Included in AOCI | 199 |
Assets, Purchases | 2,991 |
Assets, Sales | (145) |
Assets, Settlements | (1,041) |
Assets, Net transfer In (Out) of Level 3 | (601) |
Balance at End of Period | 9,589 | 8,169
Change in Unrealized Included in OCI | 199 |
Market risk benefits asset | Level 3 |  |
Debt Securities, Available-for-sale [Abstract] |  |
Balance at Beginning of Period | 117 | 41
Balance at End of Period | 88 | 117
Subtotal Level 3 liabilities at fair value |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Balance at Beginning of Period | 3,115 | 3,883
Liabilities, Total Gains (Losses) Included in Earnings | 257 | (1,382)
Liabilities, Total Gains (Losses) Included in AOCI | 0 | 0
Liabilities, Purchases | 1,049 | 768
Liabilities, Sales | 0 | 0
Liabilities, Settlements | (163) | (154)
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0
Balance at End of Period |  | 3,115
Change in Unrealized Incl in OCI |  | 0
Subtotal Level 3 liabilities at fair value | Level 3 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Balance at Beginning of Period | 3,115 |
Balance at End of Period |  | 3,115
Change in Unrealized Incl in OCI | 0 |
Market Risk benefits liability | Level 3 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Balance at Beginning of Period | 282 | 469
Balance at End of Period | $ 403 | $ 282

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