Investments (Details) - Allowance for Expected Credit Losses - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Allowance for expected credit losses [Roll Forward]
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, beginning of period			$ 3
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, end of period	$ 4		4
Total net impairment charges, including credit impairments, reported in net realized investment losses in the consolidated statement of income	$ 1	$ 14	$ 2	$ 35
Credit losses on fixed maturities recognized in the consolidated statement of income, as a percentage of the fixed maturity portfolio on a pre-tax basis (less than)	1.00%	1.00%	1.00%	1.00%
Credit losses on fixed maturities recognized in the consolidated statement of income, as a percentage of shareholders' equity on an after-tax basis (less than)	1.00%	1.00%	1.00%	1.00%
Corporate and all other bonds [Member]
Allowance for expected credit losses [Roll Forward]
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, beginning of period	$ 4	$ 4	$ 3	$ 3
Additions for expected credit losses on securities where no credit losses were previously recognized	0	0	0	0
Additions for expected credit losses on securities where credit losses were previously recognized	0	0	1	1
Reductions due to sales/defaults of credit-impaired securities	0	(1)	0	(1)
Reductions for impairments of securities which the Company intends to sell or more likely than not will be required to sell	0	0	0	0
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, end of period	$ 4	$ 3	$ 4	$ 3