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Supplemental Financial Information - Other accrued liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Accrued Liabilities:    
Accrued rebates payable to government agencies $ 316 $ 212
Accrued other rebates 805 655
All other 4,044 3,168
Total 5,165 4,035
Accrued wholesaler chargeback rebates $ 178 $ 175