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Goodwill and Intangible Assets - Goodwill and Disposal (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2017	Nov. 06, 2017
Goodwill [Line Items]
Goodwill, impairment loss	$ 0		$ 135
Goodwill [Roll Forward]
Goodwill, beginning balance			38,249
Acquisitions			52
Foreign currency translation adjustments			3
Impairment	0		(135)
Goodwill, ending balance	38,169		38,169
Pharmacy Services Segment
Goodwill [Roll Forward]
Goodwill, beginning balance			21,637
Goodwill, ending balance	21,637		21,637
Retail/LTC Segment
Goodwill [Line Items]
Goodwill, impairment loss			135
Goodwill [Roll Forward]
Goodwill, beginning balance			16,612
Acquisitions			52
Foreign currency translation adjustments			3
Impairment			(135)
Goodwill, ending balance	$ 16,532		$ 16,532
Rx Crossroads Member
Goodwill [Line Items]
Goodwill, impairment loss		$ 135
Goodwill [Roll Forward]
Impairment		$ (135)
Forecast \| Rx Crossroads Member \| Disposal Group by sale
Disposal group
Consideration				$ 735