Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net investment income	$ 1,466	$ 1,332	$ 2,924	$ 2,679
Operating Segments | Annuities
Segment Reporting Information [Line Items]
Net investment income	464	405	916	785
Operating Segments | Life Insurance
Segment Reporting Information [Line Items]
Net investment income	631	565	1,255	1,187
Operating Segments | Group Protection
Segment Reporting Information [Line Items]
Net investment income	94	88	183	173
Operating Segments | Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	252	247	503	491
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 25	$ 27	$ 67	$ 43