Intangible Assets (Change in Goodwill) (Details) - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | |
|---|---|---|---|
May 31, 2018 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Goodwill [Roll Forward] | |||
| Goodwill, Beginning | $ 423 | $ 377 | |
| Goodwill Acquired During the Year | 1,127 | 46 | |
| Adjustments to Goodwill | (3) | ||
| Goodwill, Ending | 1,547 | 423 | |
| Hotel Franchising | |||
| Goodwill [Roll Forward] | |||
| Goodwill, Beginning | 385 | 340 | |
| Goodwill Acquired During the Year | 1,067 | 45 | |
| Adjustments to Goodwill | (3) | ||
| Goodwill, Ending | 1,449 | 385 | |
| Hotel Management | |||
| Goodwill [Roll Forward] | |||
| Goodwill, Beginning | 38 | 37 | |
| Goodwill Acquired During the Year | 60 | 1 | |
| Adjustments to Goodwill | 0 | ||
| Goodwill, Ending | $ 98 | $ 38 | |
| Knights Inn | |||
| Goodwill [Roll Forward] | |||
| Cash proceeds from sale of hotel brand | $ 2 | ||
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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