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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowances for Doubtful Accounts and Product Returns - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowances for Doubtful Accounts and Product Returns      
Balance at beginning of period $ 384 $ 314 $ 294
Provisions/charges to income 187 137 110
Amounts charged off and other deductions (111) (68) (90)
Total $ 460 $ 384 $ 314