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Note 8. Supplemental Balance Sheet Information Other Assets, Noncurrent (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Other Assets, Noncurrent [Line Items] |  |  |  |
Other assets |  | $ 724 |  |
Continuing Operations [Member] |  |  |  |
Other Assets, Noncurrent [Line Items] |  |  |  |
Other assets |  | 724 |  | $ 345
Other Assets, Miscellaneous, Noncurrent |  | 369 |  | 345
GrubHub Inc. [Domain] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Continuing Operations [Member] |  |  |  |
Other Assets, Noncurrent [Line Items] |  |  |  |
Equity Securities, FV-NI | [1] | 214 |  |
GrubHub Inc. [Member] | Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Continuing Operations [Member] |  |  |  |
Other Assets, Noncurrent [Line Items] |  |  |  |
Equity Securities, FV-NI | [1] |  |  | 0
Franchise Incentive [Member] | Continuing Operations [Member] |  |  |  |
Other Assets, Noncurrent [Line Items] |  |  |  |
Other assets | [2] | $ 141 |  | $ 0
Franchise Incentive [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
Other Assets, Noncurrent [Line Items] |  |  |  |
Other assets |  |  | $ 118 |
[1] | Refer to Note 5 for additional discussion regarding our investment in Grubhub.
[2] | Increase from 2017 primarily due to the adoption of Topic 606 beginning with the year ended December 31, 2018. See Note 2.

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