Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ (259)	$ 80	$ (366)	$ 118
Net realized (losses) gains	(338)	147	(483)	227
Not Designated as Hedging Instrument
Schedule of Investments [Line Items]
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax	15	0	21	(7)
Other, net
Schedule of Investments [Line Items]
Other, net	(6)	(4)	45	25
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Realized Gain (Loss)	5	2	45	8
Equity Securities, FV-NI, Unrealized Gain (Loss)	(267)	86	(414)	123
Equity securities	(262)	88	(369)	131
Total Fixed Maturities, AFS
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Realized Gain	15	68	38	99
Gross losses on sales of fixed maturities	(80)	(15)	(175)	(46)
Change in ACL on fixed maturities, AFS	0	0	(12)	4
Reduction due to intent to sell	0	0	(3)	0
Mortgages [Member]
Schedule of Investments [Line Items]
Change in ACL on mortgage loans	$ (5)	$ 10	$ (7)	$ 14

Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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