Fair Value Measurements - Fair Value Option (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value	$ 480	$ 582	[1]
Aggregate contractual principal	10,911	10,967	[1]
Mortgage loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Aggregate contractual principal	$ 491	$ 591

[1] (1) Recast for the adoption of ASU 2018-12. See Notes 1 and 2 to the Condensed Consolidated Financial Statements.