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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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