Fair Value Measurements - Gains or Losses Recorded Related to Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ (165)	$ 244
Other bond securities
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	(3)	11
Alternative investments
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	(8)	24
Retained investment in Corebridge
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ (154)	$ 209