v3.26.1
Fair Value Measurements - The carrying value and fair value of financial instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financial assets:    
Mortgage loans $ 920 $ 947
Total financial assets not accounted for at fair value 16,259 15,979
Long-term debt 1,821 1,820
Total financial liabilities not accounted for at fair value 4,001 3,913
Level 1    
Financial assets:    
Cash and cash equivalents 1,438 1,727
Mortgage loans 0 0
Total financial assets not accounted for at fair value 833 946
Long-term debt 0 0
Total financial liabilities not accounted for at fair value 202 298
Level 2    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 0 0
Total financial assets not accounted for at fair value 14,452 14,025
Long-term debt 1,548 1,606
Total financial liabilities not accounted for at fair value 3,782 3,597
Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 908 937
Total financial assets not accounted for at fair value 974 1,008
Long-term debt 3 3
Total financial liabilities not accounted for at fair value 17 18
Carrying Value    
Financial assets:    
Cash and cash equivalents 1,438 1,727
Mortgage loans 920 947
Total financial assets not accounted for at fair value 2,358 2,674
Long-term debt 1,821 1,820
Total financial liabilities not accounted for at fair value 1,821 1,820
Fair Value    
Financial assets:    
Cash and cash equivalents 1,438 1,727
Mortgage loans 908 937
Total financial assets not accounted for at fair value 2,346 2,664
Long-term debt 1,551 1,609
Total financial liabilities not accounted for at fair value 1,551 1,609
Fair Value | Level 1    
Financial assets:    
Total financial assets not accounted for at fair value 1,438 1,727
Total financial liabilities not accounted for at fair value 0 0
Fair Value | Level 2    
Financial assets:    
Total financial assets not accounted for at fair value 0 0
Total financial liabilities not accounted for at fair value 1,548 1,606
Fair Value | Level 3    
Financial assets:    
Total financial assets not accounted for at fair value 908 937
Total financial liabilities not accounted for at fair value $ 3 $ 3