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Qualifying And Valuation Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 125 $ 112 $ 110
Additions Acquisition 13 0 0
Additions Charged to costs and expenses (2) 11 12
(Credited) charged to other accounts (9) 6 (2)
Deductions (5) (4) (8)
Balance at end of period 122 125 112
Deferred tax asset valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 454 420 310
Additions Acquisition 38 0 0
Additions Charged to costs and expenses 37 77 117
(Credited) charged to other accounts (30) 26 0
Deductions (98) (69) (7)
Balance at end of period $ 401 $ 454 $ 420