Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Net investment income	$ 1,544	$ 1,416	$ 4,478	$ 4,104
Operating Segments | Annuities
Segment Reporting Information [Line Items]
Net investment income	469	418	1,385	1,203
Operating Segments | Life Insurance
Segment Reporting Information [Line Items]
Net investment income	687	623	1,950	1,817
Operating Segments | Group Protection
Segment Reporting Information [Line Items]
Net investment income	98	87	281	261
Operating Segments | Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	257	253	760	744
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 33	$ 35	$ 102	$ 79