Insurance Liabilities (Future Policy Benefits Information by Product) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 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	$ 32,387	$ 29,924
Future policy benefits	32,387		$ 32,149
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	2,935	2,764	2,899	$ 2,804
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance	3,177	3,192	3,162	3,146
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Model Refinements			4	0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			146	206
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			9	(36)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			3,321	3,316
Liability for Future Policy Benefit, Expected Net Premium, Issuance	52	71
Liability for Future Policy Benefit, Expected Net Premium, Interest Income	83	80
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected	(279)	(275)
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(242)	(428)
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	5,528	5,071	5,385	5,172
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	5,963	5,935	5,905	5,816
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Model Refinements			10	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			235	296
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			11	(39)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			6,161	6,073
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	56	74
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	161	157
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(415)	(369)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(435)	(864)
Liability for Future Policy Benefit, before Reinsurance	2,593	2,307
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	19	26
Future policy benefits	$ 2,574	$ 2,281
Liability for Future Policy Benefit, Weighted-Average Duration	7 years 9 months 18 days	8 years 10 months 24 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate	3.92%	3.92%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	4.75%	5.87%
Liability for Future Policy Benefit, Gross Premium Income	$ 414	$ 439
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	5,787	6,079
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	4,299	4,598
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	8,115	8,194
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance	5,963	5,935
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) from Cash Flow Change			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	3,860	3,449	3,719	3,469
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	4,086	3,957	3,993	3,848
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) from Cash Flow Change			(23)	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(2)	18
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			3,968	3,866
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	302	277
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	112	106
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(296)	(292)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(226)	(508)
Liability for Future Policy Benefit, before Reinsurance	3,860	3,449
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	32	30
Future policy benefits	$ 3,828	$ 3,419
Liability for Future Policy Benefit, Weighted-Average Duration	8 years	8 years 3 months 18 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate	4.03%	3.96%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	4.82%	5.87%
Liability for Future Policy Benefit, Gross Premium Income	$ 377	$ 339
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	5,716	5,570
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance	4,086	3,957
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) from Cash Flow Change			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	6,586	6,192	6,697	6,793
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	6,947	7,148	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) from Cash Flow Change			81	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(11)	(49)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			$ 7,155	$ 7,361
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	0	0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense	230	236
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment	(438)	(449)
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax	(361)	(956)
Liability for Future Policy Benefit, before Reinsurance	6,586	6,192
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance	63	0
Future policy benefits	$ 6,523	$ 6,192
Liability for Future Policy Benefit, Weighted-Average Duration	11 years 6 months	11 years 7 months 6 days
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate	4.46%	4.45%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	5.00%	5.91%
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	13,465	13,909
Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance	$ 6,947	$ 7,148