Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 4,685	$ 4,584
Revenue adjustments from annuity and life insurance product features	227	(580)
Credit loss-related adjustments	(28)	(1)
Investment gains (losses)	(103)	(81)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(90)	194
Total revenues	4,691	4,116
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	52	27
Revenue adjustments from annuity and life insurance product features	0	0
Credit loss-related adjustments	(8)	(2)
Investment gains (losses)	14	(66)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(11)	(8)
Total revenues	47	(49)
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,198	1,269
Revenue adjustments from annuity and life insurance product features	209	(446)
Credit loss-related adjustments	(17)	(4)
Investment gains (losses)	(6)	19
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	10	(3)
Total revenues	1,394	835
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,587	1,541
Revenue adjustments from annuity and life insurance product features	18	(134)
Credit loss-related adjustments	1	5
Investment gains (losses)	(109)	(29)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	(89)	205
Total revenues	1,408	1,588
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,521	1,425
Revenue adjustments from annuity and life insurance product features	0	0
Credit loss-related adjustments	(2)	0
Investment gains (losses)	0	0
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0
Total revenues	1,519	1,425
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	327	322
Revenue adjustments from annuity and life insurance product features	0	0
Credit loss-related adjustments	(2)	0
Investment gains (losses)	(2)	(5)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans	0	0
Total revenues	$ 323	$ 317