Disposition of Metropolitan Property and Casualty Insurance Company - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net investment gains (losses)	$ (1,262)	$ 1,529	$ (110)
Gain (Loss) on Sale of Business	2,558	6,575	5,418
Income (loss) from continuing operations before provision for income tax	$ 2,859	8,126	6,927
Metropolitan Property and Casualty Insurance Company
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses		3,900	3,900
Net investment gains (losses)		1,400
Gain (Loss) on Sale of Business		1,000
Income (loss) from continuing operations before provision for income tax		$ 121	$ 399