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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 18 $ 14 $ 12
Provision/reversals Charged to Costs & Expenses (3) 4 2
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Period 15 18 14
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 45 39 32
Provision/reversals Charged to Costs & Expenses 6 6 7
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Period $ 51 $ 45 $ 39