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Revenues - Disaggregation of Revenue Stream (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 5,346 $ 5,211 $ 10,352 $ 10,123
Segments        
Disaggregation of Revenue [Line Items]        
Revenues 5,119 4,953 9,981 9,687
Segments | North American Full-Service        
Disaggregation of Revenue [Line Items]        
Revenues 3,356 3,277 6,655 6,517
Segments | North American Limited-Service        
Disaggregation of Revenue [Line Items]        
Revenues 888 836 1,649 1,577
Segments | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Revenues 268 252 543 493
Segments | Other International        
Disaggregation of Revenue [Line Items]        
Revenues 607 588 1,134 1,100
Unallocated corporate        
Disaggregation of Revenue [Line Items]        
Revenues 227 258 371 436
Fee revenues        
Disaggregation of Revenue [Line Items]        
Gross revenues 951 848 1,796 1,607
Contract investment amortization (13) (12) (31) (23)
Revenues 938 836 1,765 1,584
Fee revenues | Segments        
Disaggregation of Revenue [Line Items]        
Gross revenues 833 764 1,567 1,443
Contract investment amortization (13) (12) (31) (23)
Revenues 820 752 1,536 1,420
Fee revenues | Segments | North American Full-Service        
Disaggregation of Revenue [Line Items]        
Gross revenues 345 317 644 606
Contract investment amortization (7) (6) (18) (12)
Revenues 338 311 626 594
Fee revenues | Segments | North American Limited-Service        
Disaggregation of Revenue [Line Items]        
Gross revenues 250 230 446 411
Contract investment amortization (3) (3) (6) (6)
Revenues 247 227 440 405
Fee revenues | Segments | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Gross revenues 110 98 227 195
Contract investment amortization (1) (1) (1) (1)
Revenues 109 97 226 194
Fee revenues | Segments | Other International        
Disaggregation of Revenue [Line Items]        
Gross revenues 128 119 250 231
Contract investment amortization (2) (2) (6) (4)
Revenues 126 117 244 227
Owned, leased, and other        
Disaggregation of Revenue [Line Items]        
Revenues 423 448 829 876
Owned, leased, and other | Segments        
Disaggregation of Revenue [Line Items]        
Revenues 403 437 796 855
Owned, leased, and other | Segments | North American Full-Service        
Disaggregation of Revenue [Line Items]        
Revenues 140 181 295 378
Owned, leased, and other | Segments | North American Limited-Service        
Disaggregation of Revenue [Line Items]        
Revenues 37 32 70 63
Owned, leased, and other | Segments | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Revenues 48 49 95 90
Owned, leased, and other | Segments | Other International        
Disaggregation of Revenue [Line Items]        
Revenues 178 175 336 324
Reimbursements        
Disaggregation of Revenue [Line Items]        
Revenues 3,985 3,927 7,758 7,663
Reimbursements | Segments        
Disaggregation of Revenue [Line Items]        
Revenues 3,896 3,764 7,649 7,412
Reimbursements | Segments | North American Full-Service        
Disaggregation of Revenue [Line Items]        
Revenues 2,878 2,785 5,734 5,545
Reimbursements | Segments | North American Limited-Service        
Disaggregation of Revenue [Line Items]        
Revenues 604 577 1,139 1,109
Reimbursements | Segments | Asia Pacific        
Disaggregation of Revenue [Line Items]        
Revenues 111 106 222 209
Reimbursements | Segments | Other International        
Disaggregation of Revenue [Line Items]        
Revenues $ 303 $ 296 $ 554 $ 549