Segment Information - Schedule of Identifiable assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2021
Segment Reporting Information [Line Items]
Total assets	$ 539,306	$ 522,228	$ 598,841
Capital Expenditures	240	210
General Insurance | Reportable Subsegments
Segment Reporting Information [Line Items]
Total assets	139,371	147,083
Capital Expenditures	158	68
Life and Retirement | Reportable Subsegments
Segment Reporting Information [Line Items]
Total assets	375,197	352,694
Capital Expenditures	43	102
Corporate and Other [Member] | Reportable Subsegments
Segment Reporting Information [Line Items]
Total assets	24,738	22,451
Capital Expenditures	$ 39	$ 40