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Segment and Related Information - Goodwill (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | $ 6,430 | $ 6,247 |
Acquired goodwill |  | 108 | 248 |
Divested goodwill |  |  | (25) |
Impairments | $ (27) | (27) | (6) | $ (34)
Foreign currency translation |  | 21 | (34) |
Goodwill, Ending Balance | 6,532 | 6,532 | 6,430 | 6,247
Goodwill post-closing adjustment increase (decrease) |  | (3) |  |
Tier 1 [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 2,193 | 2,117 |
Acquired goodwill |  | 90 | 82 |
Divested goodwill |  |  | (6) |
Goodwill, Ending Balance | 2,283 | 2,283 | 2,193 | 2,117
Tier 2 [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 1,584 | 1,595 |
Acquired goodwill |  | 12 | 23 |
Foreign currency translation |  | 21 | (34) |
Goodwill, Ending Balance | 1,617 | 1,617 | 1,584 | 1,595
Tier 3 [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 2,556 | 2,414 |
Acquired goodwill |  | 6 | 142 |
Goodwill, Ending Balance | 2,562 | 2,562 | 2,556 | 2,414
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 97 | 121 |
Acquired goodwill |  |  | 1 |
Divested goodwill |  |  | (19) |
Impairments |  | (27) | (6) |
Goodwill, Ending Balance | $ 70 | $ 70 | $ 97 | $ 121

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