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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 3,596 $ 3,817  
Deductions (13,970) (13,125)  
Balance at end of period 3,734 3,596 $ 3,817
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 164 162 164
Charged to costs and expenses 35 10 8
Charged to other accounts (8) (6) (2)
Deductions (46) (2) (8)
Balance at end of period 146 164 162
Valuation Allowance in Tax Carryforward Losses And Deductions [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 3,009 3,072 2,723
Charged to costs and expenses 100 161 443
Deductions (1,093) (224) (93)
Balance at end of period $ 2,017 $ 3,009 $ 3,072