Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Schedule of Investments [Line Items]
Net realized gains (losses)	$ 28	$ (7)
Proceeds from Sale of Debt Securities, Available-for-sale	1,548	2,228
Debt Securities [Member]
Schedule of Investments [Line Items]
Proceeds from Sale of Debt Securities, Available-for-sale	400	1,400
Not Designated as Hedging Instrument
Schedule of Investments [Line Items]
Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax	2	(7)
Non-qualifying foreign currency derivatives	(2)	5
Realized Investment Gains Losses
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	36	2
Other, net
Schedule of Investments [Line Items]
Other, net	(3)	(15)
Total Fixed Maturities, AFS
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Realized Gain	5	17
Gross losses on sales of fixed maturities	(11)	(39)
Change in ACL on fixed maturities, AFS	(1)	(5)
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Realized Gain (Loss)	(12)	50
Equity Securities, FV-NI, Unrealized Gain (Loss)	47	(15)
Equity securities	35	35
Mortgages [Member]
Schedule of Investments [Line Items]
Change in ACL on mortgage loans	$ 3	$ 0