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Goodwill and Other Intangible Assets - Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Intangible assets |  |  |
Goodwill | $ 8,994 | $ 6,532 | $ 6,430
Increase in goodwill during the period | 2,462 |  |
Intangible assets | 1,646 | 1,088 |
Less: Accumulated amortization | (622) | (567) |
Total | 1,024 | 521 |
Customer and supplier relationships [Member] |  |  |
Intangible assets |  |  |
Intangible assets | 1,436 | 906 |
Less: Accumulated amortization | (497) | (469) |
Total | 939 | 437 |
Covenants not-to-compete [Member] |  |  |
Intangible assets |  |  |
Intangible assets | 68 | 72 |
Less: Accumulated amortization | (46) | (36) |
Total | 22 | 36 |
Licenses Permits and Other [Member] |  |  |
Intangible assets |  |  |
Intangible assets | 142 | 110 |
Less: Accumulated amortization | (79) | (62) |
Total | $ 63 | $ 48 |

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