Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net investment income	$ 5,879	$ 5,515	$ 6,111
Other Operations
Segment Reporting Information [Line Items]
Net investment income	148	155	148
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Net investment income	1,668	1,463	1,400
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Net investment income	2,712	2,587	3,207
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Net investment income	339	334	365
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Net investment income	$ 1,012	$ 976	$ 991