Summary Of Changes In The Net Liability Position For Market Risk Benefits (Detail) - USD ($) $ in Millions	Jan. 01, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk	$ 1,288	$ 582	$ 722
Market risk benefit, reinsurance recoverable, after allowance	244
Market risk benefit, after reinsurance and cumulative increase (decrease) from instrument-specific credit risk change	1,044
Fixed Indexed Annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk	115	55	52
Market risk benefit, reinsurance recoverable, after allowance	0
Market risk benefit, after reinsurance and cumulative increase (decrease) from instrument-specific credit risk change	115
Variable annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk	1,173	$ 527	$ 670
Market risk benefit, reinsurance recoverable, after allowance	244
Market risk benefit, after reinsurance and cumulative increase (decrease) from instrument-specific credit risk change	929
Previously reported
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk				$ 641
Previously reported | Fixed Indexed Annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk				71
Previously reported | Variable annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Market risk benefit, after increase (decrease) from instrument-specific credit risk				$ 570
Adjustment for the difference between carrying amount and fair value, except for the difference due to instrument-specific credit risk | Effect Of Retrospective Application Of Accounting Standards Update 2018-12
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Change in market risk benefits, except instrument-specific credit risk	623
Adjustment for the difference between carrying amount and fair value, except for the difference due to instrument-specific credit risk | Effect Of Retrospective Application Of Accounting Standards Update 2018-12 | Fixed Indexed Annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Change in market risk benefits, except instrument-specific credit risk	39
Adjustment for the difference between carrying amount and fair value, except for the difference due to instrument-specific credit risk | Effect Of Retrospective Application Of Accounting Standards Update 2018-12 | Variable annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Change in market risk benefits, except instrument-specific credit risk	584
Adjustment for the cumulative effect of changes in the instrument-specific credit risk since issuance | Effect Of Retrospective Application Of Accounting Standards Update 2018-12
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Change in market risk benefits, instrument-specific credit risk	24
Adjustment for the cumulative effect of changes in the instrument-specific credit risk since issuance | Effect Of Retrospective Application Of Accounting Standards Update 2018-12 | Fixed Indexed Annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Change in market risk benefits, instrument-specific credit risk	5
Adjustment for the cumulative effect of changes in the instrument-specific credit risk since issuance | Effect Of Retrospective Application Of Accounting Standards Update 2018-12 | Variable annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Change in market risk benefits, instrument-specific credit risk	19
Total adjustment for the difference between carrying amount and fair value | Effect Of Retrospective Application Of Accounting Standards Update 2018-12
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Total adjustment	647
Total adjustment for the difference between carrying amount and fair value | Effect Of Retrospective Application Of Accounting Standards Update 2018-12 | Fixed Indexed Annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Total adjustment	44
Total adjustment for the difference between carrying amount and fair value | Effect Of Retrospective Application Of Accounting Standards Update 2018-12 | Variable annuities
Disclosure In Tabular Form Of Changes In The Net Liability Position For Market Risk Benefits Due To Adoption of New Accounting Guidance Related To The Recognition And Measurement Of Long Duration Insurance Contracts [Line Items]
Total adjustment	$ 603