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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 4,904 $ 6,246  
Deductions (14,036) (15,707)  
Balance at end of period 4,309 4,904 $ 6,246
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 200 209 232
Charged to costs and expenses (8) (11) (16)
Charged to other accounts 0 2 0
Deductions (28) 0 (7)
Balance at end of period 164 200 209
Valuation Allowance in Tax Carryforward Losses And Deductions [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 2,547 1,974 1,633
Charged to costs and expenses 336 670 555
Deductions (160) (97) (214)
Balance at end of period $ 2,723 $ 2,547 $ 1,974