Policyholder Account Balances, Future Policy Benefits and Claims - Change in Unearned Income (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024
Deferred Income [Roll Forward]
Beginning balance	$ 570	$ 489
Deferral of revenue	95	121
Amortization	(34)	(40)
Ending balance	631	570
Universal Life Insurance
Deferred Income [Roll Forward]
Beginning balance	26	27
Deferral of revenue	1	0
Amortization	(1)	(1)
Ending balance	26	26
Variable Universal Life Insurance
Deferred Income [Roll Forward]
Beginning balance	249	196
Deferral of revenue	59	70
Amortization	(15)	(17)
Ending balance	293	249
Indexed Universal Life Insurance
Deferred Income [Roll Forward]
Beginning balance	295	266
Deferral of revenue	35	51
Amortization	(18)	(22)
Ending balance	$ 312	$ 295

Amount of deferred income excluding obligation to transfer product and service to customer for which consideration has been received or is receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479432/944-30-50-2B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 25
-Paragraph 2
-SubTopic 10
-Topic 470
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481174/470-10-25-2

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Amount of increase in deferred income not accounted for under Topic 606.

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Amount of revenue recognized previously reported as deferred income not accounted for under Topic 606.

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