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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ (240)	$ 61	$ 538	$ 241
Other bond securities
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	10	20	37	27
Alternative investments
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	98	76	185	184
Retained investment in Corebridge
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ (348)	$ (35)	$ 316	$ 30