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Fair Value of Financial Instruments - Schedule of Carrying Value and Estimated Fair Value of Financial Instruments Carried at Other Than Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets
Investments in unconsolidated affiliates	$ 4,925	$ 3,731
Trade and notes receivables, net of allowance	475	471
Total
Total Estimated Fair Value
Assets
FHLB common stock	145	153
Commercial mortgage loans	3,068	2,404
Residential mortgage loans	3,896	2,916
Investments in unconsolidated affiliates	4,462	3,293
Policy loans	136	104
Other invested assets	91	90
Company-owned life insurance	875	431
Trade and notes receivables, net of allowance	475	471
Total	13,148	9,862
Liabilities
Investment contracts, included in contractholder funds	50,316	46,339
Debt	4,244	3,781
Total	54,560	50,120
Carrying Amount
Assets
FHLB common stock	145	153
Commercial mortgage loans	3,284	2,705
Residential mortgage loans	4,107	3,221
Investments in unconsolidated affiliates	4,462	3,293
Policy loans	136	104
Other invested assets	91	90
Company-owned life insurance	875	431
Trade and notes receivables, net of allowance	475	471
Total	13,575	10,468
Liabilities
Investment contracts, included in contractholder funds	55,715	51,184
Debt	4,398	4,321
Total	60,113	55,505
Level 1
Assets
FHLB common stock	0	0
Commercial mortgage loans	0	0
Residential mortgage loans	0	0
Investments in unconsolidated affiliates	0	0
Policy loans	0	0
Other invested assets	39	42
Company-owned life insurance	0	0
Trade and notes receivables, net of allowance	0	0
Total	39	42
Liabilities
Investment contracts, included in contractholder funds	0	0
Debt	0	0
Total	0	0
Level 2
Assets
FHLB common stock	145	153
Commercial mortgage loans	0	0
Residential mortgage loans	0	0
Investments in unconsolidated affiliates	0	0
Policy loans	0	0
Other invested assets	0	0
Company-owned life insurance	0	0
Trade and notes receivables, net of allowance	0	0
Total	145	153
Liabilities
Investment contracts, included in contractholder funds	0	0
Debt	4,244	3,781
Total	4,244	3,781
Level 3
Assets
FHLB common stock	0	0
Commercial mortgage loans	3,068	2,404
Residential mortgage loans	3,896	2,916
Investments in unconsolidated affiliates	2	5
Policy loans	136	104
Other invested assets	0	0
Company-owned life insurance	875	431
Trade and notes receivables, net of allowance	475	471
Total	8,452	6,331
Liabilities
Investment contracts, included in contractholder funds	50,316	46,339
Debt	0	0
Total	50,316	46,339
NAV
Assets
Investments in unconsolidated affiliates	4,460	3,288
Other invested assets	52	48
Total	$ 4,512	$ 3,336

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