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Insurance Liabilities (Future Policy Benefits Information by Product) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, before Reinsurance	$ 32,245	$ 32,286
Future policy benefits	32,245		$ 32,569
Term and Whole Life Insurance
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change	2,881	2,895	2,974	$ 2,871
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance	3,189	3,165	3,234	3,212
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements			1	0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(7)	(9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			3,228	3,203
Liability for Future Policy Benefit, Expected Net Premium, Issuance	24	24
Liability for Future Policy Benefit, Expected Net Premium, Interest Income	29	28
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected	(92)	(90)
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(308)	(270)
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	5,327	5,359	5,507	5,279
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	5,946	5,860	6,023	5,922
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements			1	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(5)	(9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			6,019	5,913
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	25	24
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	55	54
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(153)	(131)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(619)	(501)
Liability for Future Policy Benefit, before Reinsurance	2,446	2,464
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	38	43
Future policy benefits	$ 2,408	$ 2,421
Liability for Future Policy Benefit, Weighted-Average Duration	8 years 8 months 12 days	8 years 4 months 24 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate	3.94%	3.96%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	5.24%	4.90%
Liability for Future Policy Benefit, Gross Premium Income	$ 140	$ 153
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	6,057	6,618
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	4,553	4,905
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	8,232	8,099
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance	5,946	5,860
Income Annuities
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change	0	0	0	0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance	0	0	0	0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements			0	0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			0	0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			0	0
Liability for Future Policy Benefit, Expected Net Premium, Issuance	0	0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income	0	0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected	0	0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	3,717	3,604	3,754	3,512
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	4,068	3,891	4,031	3,897
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements			0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			4	(31)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			4,035	3,866
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	99	78
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	38	36
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(104)	(89)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(351)	(287)
Liability for Future Policy Benefit, before Reinsurance	3,717	3,604
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	30	26
Future policy benefits	$ 3,687	$ 3,578
Liability for Future Policy Benefit, Weighted-Average Duration	8 years 1 month 6 days	8 years 4 months 24 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate	3.99%	3.87%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	5.24%	4.92%
Liability for Future Policy Benefit, Gross Premium Income	$ 123	$ 102
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	0	0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	5,765	5,375
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance	4,068	3,891
Structured Settlement and Pension Risk Transfer Annuities
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change	0	0	0	0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance	0	0	0	0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements			0	0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			0	0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			0	0
Liability for Future Policy Benefit, Expected Net Premium, Issuance	0	0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income	0	0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected	0	0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change	6,437	6,928	6,697	6,793
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	7,013	7,313	7,085	7,410
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements			0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(2)	(31)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			$ 7,083	$ 7,379
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	77	80
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(147)	(146)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(576)	(385)
Liability for Future Policy Benefit, before Reinsurance	6,437	6,928
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	62	69
Future policy benefits	$ 6,375	$ 6,859
Liability for Future Policy Benefit, Weighted-Average Duration	11 years 7 months 6 days	11 years 7 months 6 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate	4.46%	4.46%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	5.32%	5.00%
Liability for Future Policy Benefit, Gross Premium Income	$ 0	$ 0
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	0	0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	13,622	14,224
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance	$ 7,013	$ 7,313

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Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate.

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Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from increase (decrease) in expected net premium component of liability for future policy benefit from change in discount rate.

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Amount, after effect of reinsurance, of liability for future policy benefit.

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Current weighted-average discount rate used to measure liability for future policy benefit.

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Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected future benefit and expense component for liability for future policy benefit, discounted at original rate.

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Amount, before effect of reinsurance, of discounted balance for expected future gross premium component of liability for future policy benefit.

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Amount, before effect of reinsurance, of undiscounted balance for expected future gross premium component of liability for future policy benefit.

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Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected future policy benefit and expense component of liability for future policy benefit.

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Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from effect of variance from cash flow assumption change for actual experience.

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