Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Contract Liabilities) (Details)

v3.10.0.1
Revenue Recognition (Contract Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]    
Contract liabilities $ 247 $ 248
Previously Reported Balance    
Disaggregation of Revenue [Line Items]    
Contract liabilities   216
New Revenue Standard Adjustments    
Disaggregation of Revenue [Line Items]    
Contract liabilities   248
Deferred initial franchise fee revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities 128 116
Deferred initial franchise fee revenue | Previously Reported Balance    
Disaggregation of Revenue [Line Items]    
Contract liabilities   98
Deferred initial franchise fee revenue | New Revenue Standard Adjustments    
Disaggregation of Revenue [Line Items]    
Contract liabilities   116
Deferred loyalty program revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities 74 54
Deferred co-branded credit card programs revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities 0 37
Deferred hotel management fee revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities 24 19
Deferred other revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities $ 21 22
Deferred other revenue | Previously Reported Balance    
Disaggregation of Revenue [Line Items]    
Contract liabilities   8
Deferred other revenue | New Revenue Standard Adjustments    
Disaggregation of Revenue [Line Items]    
Contract liabilities   $ 22