Fair Value Measurements - Changes in Level 3 Financial Assets and Financial Liabilities Carried at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Transfers into/(out of) Level 3
Change in unrealized gains or losses included in Other comprehensive income for assets held at the end of the reporting period	$ (10)	$ (6)
Debt and Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance	854	555
Total gains (losses) included in shareholders' net income	(22)	(7)
Gains (losses) included in other comprehensive income	(6)	(12)
Gains (losses) required to adjust future policy benefits for settlement annuities	(8)	7
Purchases, sales and settlements
Purchases	138	107
Sales	(36)	(121)
Settlements	(119)	(89)
Total purchases, sales and settlements	(17)	(103)
Transfers into/(out of) Level 3
Transfers into Level 3	207	774
Transfers out of Level 3	(212)	(360)
Total transfers into/(out of) Level 3	(5)	414
Balance		854
Balance	796
Total gains (losses) included in Shareholders' net income attributable to instruments held at the reporting date	$ (17)	$ (17)

This element represents total gains or losses for the period (realized and unrealized), arising from assets included in income attributable to instruments held at the reporting date, measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in asset value.

No definition available.