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Supplemental Financial Information - Allowance for Doubtful Accounts (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Allowances for Doubtful Accounts and Product Returns  
Balance at December 31, 2020 $ 288
Provisions/charges to income 31
Amounts charged off and other deductions (9)
Balance at June 30, 2021 $ 310