Fair Value Measurements - Gains (Losses) by Location (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Funds withheld payable under reinsurance treaties
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	$ 3,249	$ 708
Included in OCI	0	0
Market risk benefit liabilities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	497	3,081
Included in OCI	1,874	(424)
Debt securities \| Corporate securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	0	2
Included in OCI	(13)	0
Equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	21	14
Included in OCI	0	0
Mortgage loans
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	(7)	0
Included in OCI	0	0
Limited partnerships
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	8	74
Included in OCI	0	0
Reinsurance recoverable on market risk benefits
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	(162)	(89)
Included in OCI	0	0
Market risk benefit assets
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	3,201	974
Included in OCI	0	0
Policy loans
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Included in Net Income	29	(2)
Included in OCI	$ 0	$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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