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Other Financial Information - Other Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Other Financial Information [Abstract]      
Income taxes payable $ 66   $ 713
Compensation and employee benefits 324   455
Branded prescription drug fee 313   284
Other accrued expenses 1,711   1,918
Total $ 2,414 $ 3,255 $ 3,370