Annual report pursuant to Section 13 and 15(d)

Franchising, Marketing and Reservation Activities Development Advance Note Financial Statement Location (Details)

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Franchising, Marketing and Reservation Activities Development Advance Note Financial Statement Location (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Net revenues $ 492 $ 560 $ 533 $ 468 $ 527 $ 604 $ 435 $ 302 $ 2,053 $ 1,868 $ 1,280
Bad Debt Expense On Development Advances                 2 1 0
Interest Earned On Unpaid Franchisee Development Advance Notes                 1 1 0
Franchisees and hotel owners                      
Disaggregation of Revenue [Line Items]                      
Development advance notes $ 84       $ 78       84 78  
Forgiveness of note receivable                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 8 $ 7 $ 6