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Fair Value Measurements - The carrying value and fair value of financial instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financial assets:    
Mortgage loans $ 961 $ 947
Long-term debt 1,820 1,820
Level 1    
Financial assets:    
Cash and cash equivalents 1,353 1,727
Mortgage loans 0 0
Total financial assets not accounted for at fair value 1,353 1,727
Long-term debt 0 0
Total financial liabilities not accounted for at fair value 0 0
Level 2    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 0 0
Total financial assets not accounted for at fair value 0 0
Long-term debt 1,549 1,606
Total financial liabilities not accounted for at fair value 1,549 1,606
Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 953 937
Total financial assets not accounted for at fair value 953 937
Long-term debt 3 3
Total financial liabilities not accounted for at fair value 3 3
Carrying Value    
Financial assets:    
Cash and cash equivalents 1,353 1,727
Mortgage loans 961 947
Total financial assets not accounted for at fair value 2,314 2,674
Long-term debt 1,820 1,820
Total financial liabilities not accounted for at fair value 1,820 1,820
Fair Value    
Financial assets:    
Cash and cash equivalents 1,353 1,727
Mortgage loans 953 937
Total financial assets not accounted for at fair value 2,306 2,664
Long-term debt 1,552 1,609
Total financial liabilities not accounted for at fair value $ 1,552 $ 1,609