Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Investments [Line Items]
Reduction due to intent to sell	$ 0	$ 3	$ 0	$ 3
Net realized losses	(90)	(166)	(161)	(649)
Proceeds from Sale of Debt Securities, Available-for-sale			4,908	12,418
Realized Investment Gains Losses
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	(14)	(84)	(5)	(439)
Debt Securities [Member]
Schedule of Investments [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	800	1,500	2,800	9,600
Not Designated as Hedging Instrument
Schedule of Investments [Line Items]
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax	13	16	(3)	37
Non-qualifying foreign currency derivatives	(74)	(19)	(108)	42
Other, net
Schedule of Investments [Line Items]
Other, net	(46)	(15)	(109)	30
Total Fixed Maturities, AFS
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Realized Gain	6	16	26	54
Gross losses on sales of fixed maturities	(27)	(81)	(87)	(256)
Change in ACL on fixed maturities, AFS	(5)	(3)	(13)	(15)
Reduction due to intent to sell	0	(2)	0	(5)
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Realized Gain (Loss)	1	(9)	75	36
Equity Securities, FV-NI, Unrealized Gain (Loss)	(14)	(72)	(43)	(486)
Equity securities	(13)	(81)	32	(450)
Mortgages [Member]
Schedule of Investments [Line Items]
Change in ACL on mortgage loans	$ (5)	$ 0	$ (10)	$ (7)