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Intangible Assets - Amortization Expense (Details) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 USD ($) Years | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Years | Jun. 30, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset amortization expense | $ 24 | $ 25 | $ 49 | $ 51
The number of succeeding years for which amortization expense is disclosed | Years | 4 |  | 4 |
Amortization expense for the remainder of 2018 | $ 49 |  | $ 49 |
Amortization expense for Year Two | 97 |  | 97 |
Amortization expense for Year Three | 95 |  | 95 |
Amortization expense for Year Four | 93 |  | 93 |
Amortization expense for Year Five | 92 |  | 92 |
Amortization expense Thereafter | 1,085 |  | 1,085 |
Amortizable—Franchise agreements (a) |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset amortization expense | 17 | 17 | 34 | 34
Amortizable—License agreements (c) |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset amortization expense | 0 | 0 | 0 | 0
Amortizable—Customer relationships (d) |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset amortization expense | 6 | 7 | 12 | 13
Amortizable—Pendings and listings (f) |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset amortization expense | 0 | 0 | 1 | 1
Amortizable—Other (g) |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible asset amortization expense | $ 1 | $ 1 | $ 2 | $ 3

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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