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v3.20.4

Receivables, net - Rollforward of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance For Doubtful Accounts Receivable Rollforward |  |  |
Beginning balance | $ 16 | $ 27 | $ 29
Additions (deductions) charged to expenses | 9 | (2) | 2
Charge-offs and other | (3) | (9) | (4)
Ending balance | 28 | $ 16 | $ 27
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Allowance For Doubtful Accounts Receivable Rollforward |  |  |
Beginning balance | $ 6 |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201613Member
Ending balance |  | $ 6 |

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