Fair Value Measurements - Gains or Losses Recorded Related to Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ 61	$ 36	$ 241	$ 175
Other bond securities
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	20	(5)	27	4
Alternative investments
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	76	41	184	171
Retained investment in Corebridge
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ (35)	$ 0	$ 30	$ 0