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Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Carrying Value    
Assets:    
Mortgage loans $ 1,511 $ 1,505
Equity securities 554 490
Liabilities:    
Investment contracts liabilities with a fixed maturity 1 1
Investment contracts liabilities without a fixed maturity 292 312
Long-term debt 63,450 64,151
Estimated Fair Value    
Assets:    
Mortgage loans 1,502 1,468
Liabilities:    
Investment contracts liabilities with a fixed maturity 1 1
Investment contracts liabilities without a fixed maturity 257 272
Long-term debt 59,956 58,724
Level 1 | Estimated Fair Value    
Assets:    
Mortgage loans 0 0
Liabilities:    
Investment contracts liabilities with a fixed maturity 0 0
Investment contracts liabilities without a fixed maturity 0 0
Long-term debt 59,956 58,724
Level 2 | Estimated Fair Value    
Assets:    
Mortgage loans 0 0
Liabilities:    
Investment contracts liabilities with a fixed maturity 0 0
Investment contracts liabilities without a fixed maturity 0 0
Long-term debt 0 0
Level 3 | Estimated Fair Value    
Assets:    
Mortgage loans 1,502 1,468
Liabilities:    
Investment contracts liabilities with a fixed maturity 1 1
Investment contracts liabilities without a fixed maturity 257 272
Long-term debt $ 0 $ 0