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Fair Value Measurements - The carrying value and fair value of financial instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Mortgage loans $ 975 $ 791
Long-term debt 1,820 1,475
Level 1    
Financial assets:    
Cash and cash equivalents 1,842 1,406
Mortgage loans 0 0
Total financial assets not accounted for at fair value 1,842 1,406
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 1,643 1,273
Total financial liabilities not accounted for at fair value 1,643 1,273
Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Mortgage loans 958 754
Total financial assets not accounted for at fair value 958 754
Long-term debt 3 3
Total financial liabilities not accounted for at fair value 3 3
Carrying Value    
Financial assets:    
Cash and cash equivalents 1,842 1,406
Mortgage loans 975 791
Total financial assets not accounted for at fair value 2,817 2,197
Long-term debt 1,820 1,475
Total financial liabilities not accounted for at fair value 1,820 1,475
Fair Value    
Financial assets:    
Cash and cash equivalents 1,842 1,406
Mortgage loans 958 754
Total financial assets not accounted for at fair value 2,800 2,160
Long-term debt 1,646 1,276
Total financial liabilities not accounted for at fair value $ 1,646 $ 1,276