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Transactions - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) Acquisition | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Transactions [Line Items] |  |  |  |  |  |
Goodwill |  | $ 245 |  | $ 245 | $ 314 | $ 328
Assets held-for-sale |  | 34 |  | 34 |  |
Liabilities held-for-sale |  | 6 |  | 6 |  |
Impairment charges |  | 128 |  | 128 |  |
Held-for-Sale [Member] |  |  |  |  |  |
Transactions [Line Items] |  |  |  |  |  |
Assets held-for-sale |  | 34 |  | 34 |  |
Liabilities held-for-sale |  | $ 6 |  | 6 |  |
Impairment charges |  |  |  | 9 |  |
Held-for-Sale [Member] | Subsequent Event [Member] |  |  |  |  |  |
Transactions [Line Items] |  |  |  |  |  |
Proceeds from sale of business | $ 28 |  |  |  |  |
Two Acquisitions [Member] |  |  |  |  |  |
Transactions [Line Items] |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  | 2 |  |  |
Purchase price consideration |  |  | $ 8 |  |  |
Goodwill |  |  | 6 |  |  |
Intangible assets |  |  | $ 2 |  |  |
Two Acquisitions [Member] | Maximum [Member] |  |  |  |  |  |
Transactions [Line Items] |  |  |  |  |  |
Acquisition related costs |  |  |  | $ 1 |  |

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