v3.26.3
Fair Value Measurements - The carrying value and fair value of financial instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Financial assets:    
Mortgage loans $ 829 $ 947
Total assets accounted for at fair value 17,167 15,979
Long-term debt 1,821 1,820
Total liabilities accounted for at fair value 4,434 3,913
Level 1    
Financial assets:    
Cash and cash equivalents 1,348 1,727
Mortgage loans 0 0
Total assets accounted for at fair value 929 946
Long-term debt 0 0
Total liabilities accounted for at fair value 332 298
Level 2    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 0 0
Total assets accounted for at fair value 15,241 14,025
Long-term debt 1,515 1,606
Total liabilities accounted for at fair value 4,084 3,597
Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 829 937
Total assets accounted for at fair value 997 1,008
Long-term debt 3 3
Total liabilities accounted for at fair value 18 18
Carrying Value    
Financial assets:    
Cash and cash equivalents 1,348 1,727
Mortgage loans 829 947
Total assets accounted for at fair value 2,177 2,674
Long-term debt 1,821 1,820
Total liabilities accounted for at fair value 1,821 1,820
Fair Value    
Financial assets:    
Cash and cash equivalents 1,348 1,727
Mortgage loans 829 937
Total assets accounted for at fair value 2,177 2,664
Long-term debt 1,518 1,609
Total liabilities accounted for at fair value 1,518 1,609
Fair Value | Level 1    
Financial assets:    
Total assets accounted for at fair value 1,348 1,727
Total liabilities accounted for at fair value 0 0
Fair Value | Level 2    
Financial assets:    
Total assets accounted for at fair value 0 0
Total liabilities accounted for at fair value 1,515 1,606
Fair Value | Level 3    
Financial assets:    
Total assets accounted for at fair value 829 937
Total liabilities accounted for at fair value $ 3 $ 3