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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial information [Line Items]                        
Total revenues $ 54,424 $ 47,490 $ 46,922 $ 45,743 $ 48,391 $ 46,186 $ 45,689 $ 44,520 $ 194,579 $ 194,579 $ 184,786 $ 177,546
Operating income (loss) 824 2,574 (1,373) 1,996 3,114 2,504 2,121 1,799 4,021 4,021 9,538 10,386
Income (loss) from continuing operations (422) 1,390 (2,562) 998 3,287 1,285 1,097 962   (596) 6,631 5,320
Net income (loss) attributable to CVS Health $ (419) $ 1,390 $ (2,563) $ 998 $ 3,287 $ 1,285 $ 1,098 $ 952   $ (594) $ 6,622 $ 5,317
Income (loss) from continuing operations attributable to CVS Health (in dollars per share) $ (0.37) $ 1.36 $ (2.52) $ 0.98 $ 3.23 $ 1.26 $ 1.07 $ 0.93   $ (0.57) $ 6.48 $ 4.93
Income (loss) from discontinued operations attributable to CVS Health (in dollars per share) 0 0 0 0 0 0 0 (0.01)   0 (0.01) 0
Net income (loss) attributable to CVS Health (in dollars per share) (0.37) 1.36 (2.52) 0.98 3.23 1.26 1.07 0.92   (0.57) 6.47 4.93
Income (loss) from continuing operations attributable to CVS Health (in dollars per share) (0.37) 1.36 (2.52) 0.98 3.22 1.26 1.07 0.92   (0.57) 6.45 4.91
Income (loss) from discontinued operations attributable to CVS Health (in dollars per share) 0 0 0 0 0 0 0 (0.01)   0 (0.01) 0
Net income (loss) attributable to CVS Health (in dollars per share) (0.37) 1.36 (2.52) 0.98 3.22 1.26 1.07 0.92   (0.57) 6.44 $ 4.90
Dividends per common share (in dollars per share) $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50   $ 2.00 $ 2.00  
Interest expense                   $ 2,619 $ 1,062 $ 1,078
Adjustments                        
Quarterly Financial information [Line Items]                        
Total revenues   $ 221 $ 214 $ 50 $ 6 $ 5 $ 4 $ 6 0   21 20
Operating income (loss)                 $ 0   $ 21 $ 20
Interest expense   $ 221 $ 214 $ 50 $ 6 $ 5 $ 4 $ 6