Fair Value Measurements - Gains or Losses Recorded Related to Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ 534	$ 98	$ 778	$ 180
Other bond securities
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	16	5	27	7
Alternative investments
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	63	28	87	108
Retained investment in Corebridge
Fair Value, Option, Quantitative Disclosures
Fair value option gain (loss)	$ 455	$ 65	$ 664	$ 65