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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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