Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 4,116	$ 3,814
Other Operations
Segment Reporting Information [Line Items]
Total revenues	27	43
Revenue adjustments from annuity and life insurance product features
Segment Reporting Information [Line Items]
Total revenues	(580)	(773)
Credit loss-related adjustments
Segment Reporting Information [Line Items]
Total revenues	(1)	(22)
Investment gains (losses)
Segment Reporting Information [Line Items]
Total revenues	(81)	(57)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans
Segment Reporting Information [Line Items]
Total revenues	194	9
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	1,269	1,141
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	1,541	1,757
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	1,425	1,388
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	$ 322	$ 328