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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 3,596 $ 3,817 $ 4,309
Deductions   (13,125) (13,513)
Balance at end of period   3,596 3,817
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 162 164 200
Charged to costs and expenses 10 8 (8)
Charged to other accounts (6) (2) 0
Deductions (2) (8) (28)
Balance at end of period 164 162 164
Valuation Allowance in Tax Carryforward Losses And Deductions [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 3,072 2,723 2,547
Charged to costs and expenses 161 443 336
Deductions (224) (93) (160)
Balance at end of period $ 3,009 $ 3,072 $ 2,723