Goodwill and Intangible Assets Goodwill Impairment Loss (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Dec. 31, 2016
Goodwill [Line Items]
Net Carrying Value	$ 5,160	$ 5,190	$ 5,157	$ 5,218
Spin-off of Park		91
Foreign currency translation	(30)	63
Ownership [Member]
Goodwill [Line Items]
Gross Carrying Value	439	444		856
Accumulated Impairment Losses	(340)	(340)		(672)
Net Carrying Value	99	104		$ 184
Spin-off of Park		423
Accumulated impairment losses, disposed of related to sale of a business		332
Spin-off of Park		91
Foreign currency translation	$ (5)	$ 11

Amount of accumulated impairment losses disposed of related to the sale of a business.

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Gross amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

No definition available.

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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.

+ References

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-Publisher FASB
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount before 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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