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Equity of Host Inc. and Capital of Host L.P. - Summary of Components of Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 6,641 $ 6,817 $ 6,612 $ 6,637
Net income 161 82 630 589
Net income 162 83 631 590
Changes in ownership and other (14) 4 9 25
Other comprehensive income (loss) 7 3 16 (5)
Issuance of common stock for comprehensive stock plans, net 6 6 8  
Dividends declared on common stock (139) (141) (416) (424)
Redemptions of limited partner interests for common stock 2   10  
Distributions to non-controlling interests (1) 0 (1) (1)
Repurchase of common stock   (57) (205) (107)
Ending Balance 6,664 6,715 6,664 6,715
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 7 7 7 7
Ending Balance 7 7 7 7
Additional Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 7,290 7,500 7,462 7,535
Changes in ownership and other (14) 5 9 26
Issuance of common stock for comprehensive stock plans, net 6 6 8  
Redemptions of limited partner interests for common stock 2   10  
Repurchase of common stock   (57) (205) (107)
Ending Balance 7,284 7,454 7,284 7,454
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (74) (78) (83) (70)
Other comprehensive income (loss) 7 3 16 (5)
Ending Balance (67) (75) (67) (75)
Retained Deficit        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (585) (615) (777) (839)
Net income 161 82 630 589
Dividends declared on common stock (139) (141) (416) (424)
Ending Balance (563) (674) (563) (674)
Non-redeemable, non-controlling interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 3 3 3 4
Net income 1 1 1 1
Changes in ownership and other 0 (1)   (1)
Distributions to non-controlling interests (1)   (1) (1)
Ending Balance 3 3 3 3
Redeemable, non-controlling interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 136 172 165 189
Net income 1 1 8 8
Changes in ownership and other 15 (3) (9) (24)
Redemptions of limited partner interests for common stock (2)   (10)  
Distributions to non-controlling interests (1) (3) (5) (6)
Ending Balance $ 149 $ 167 $ 149 $ 167