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Segment and Related Information - Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | $ 8,994 | $ 6,532 |
Acquired goodwill | 76 | 2,470 |
Divested goodwill | (47) | (15) |
Impairments |  |  | $ (27)
Foreign currency translation and other | 5 | 7 |
Goodwill, Ending Balance | 9,028 | 8,994 | 6,532
Goodwill post-closing adjustment increase (decrease) | (26) |  |
East Tier [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 5,101 | 3,616 |
Acquired goodwill | 27 | 1,479 |
Divested goodwill | (11) | (3) |
Foreign currency translation and other | 3 | 9 |
Goodwill, Ending Balance | 5,120 | 5,101 | 3,616
West Tier [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 3,823 | 2,846 |
Acquired goodwill | 15 | 991 |
Divested goodwill | (7) | (12) |
Foreign currency translation and other | 2 | (2) |
Goodwill, Ending Balance | 3,833 | 3,823 | 2,846
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill, Beginning Balance | 70 | 70 |
Acquired goodwill | 34 |  |
Divested goodwill | (29) |  |
Goodwill, Ending Balance | $ 75 | $ 70 | $ 70

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