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Segment and Related Information - Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | $ 6,532 | $ 6,430 |
Acquired goodwill | 2,470 | 108 | $ 248
Divested goodwill | (15) |  |
Impairments |  | (27) |
Foreign currency translation and other | 7 | 21 |
Goodwill, Ending Balance | 8,994 | 6,532 | 6,430
Goodwill post-closing adjustment increase (decrease) | (3) |  |
Tier 1 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 2,283 | 2,193 |
Acquired goodwill | 1,109 | 90 |
Foreign currency translation and other | (1) |  |
Goodwill, Ending Balance | 3,391 | 2,283 | 2,193
Tier 2 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 1,617 | 1,584 |
Acquired goodwill | 374 | 12 |
Divested goodwill | (12) |  |
Foreign currency translation and other | 9 | 21 |
Goodwill, Ending Balance | 1,988 | 1,617 | 1,584
Tier 3 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 2,562 | 2,556 |
Acquired goodwill | 987 | 6 |
Divested goodwill | (3) |  |
Foreign currency translation and other | (1) |  |
Goodwill, Ending Balance | 3,545 | 2,562 | 2,556
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 70 | 97 |
Impairments |  | (27) |
Goodwill, Ending Balance | $ 70 | $ 70 | $ 97

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