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Fair Value Measurements - Level 3 Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, impairment loss		$ 579
Impairment of intangible assets, indefinite-lived (excluding goodwill)	$ 108
Impairment of intangible assets, finite-lived	60
Carrying amount | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	894
Indefinite-lived intangible assets	492
Definite-lived intangible assets	60
Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		315
Indefinite-lived intangible assets		384
Definite-lived intangible assets		$ 0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	315		$ 0
Indefinite-lived intangible assets	384		0
Definite-lived intangible assets	0		0
Total level 3 assets	$ 699		$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

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Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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