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Segment Reporting - Reconciliation of operating earnings to net income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                        
Operating income (GAAP measure) $ 824 $ 2,574 $ (1,373) $ 1,996 $ 3,114 $ 2,504 $ 2,121 $ 1,799 $ 4,021 $ 4,021 $ 9,538 $ 10,386
Amortization of intangible assets                   1,006 817 795
Acquisition-related transaction and integration costs                   492 65 291
Goodwill impairments                   6,149 181 0
Impairment of long-lived assets                   43 0 0
Loss on divestiture of subsidiary                   86 9 0
Interest income on financing for the Aetna Acquisition                   (536) 0 0
Charges in connection with store rationalization                   0 215 34
Adjustments to legal reserves in connection with certain legal settlements                   0 0 (85)
Adjusted operating income                 $ 11,261 11,261 10,825 $ 11,421
RxCrossroads subsidiary                        
Segment Reporting Information [Line Items]                        
Goodwill impairments                   6,149 $ 181  
Loss on divestiture of subsidiary                   $ 725