Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	$ 37	$ 31
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	52	42
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	(10)	(39)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	4
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	(2)	(7)
Balance, end of period	75	37
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs	(6)	0
Corporate Debt Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	27	26
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	51	31
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	(10)	(32)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	4
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	0	(6)
Balance, end of period	62	27
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs	(6)	0
Asset-backed Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	10	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	0	10
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	(2)	0
Balance, end of period	12	10
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs	0	0
Commercial Mortgage Backed Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	0	1
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	1	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	0	(1)
Balance, end of period	1	0
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs	0	0
Debt Security, Government, Non-US [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	0	4
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment	0	1
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	(7)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	0	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	0	(2)
Balance, end of period	0	0
Other Than Temporary Impairment Credit Losses Recognized In Earnings Write Offs	$ 0	$ 0