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Segment Reporting - Reconciliation from Operating Income to Adjusted Operating Income (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
store
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
store
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Operating income (GAAP measure)   $ 3,249 $ 2,928 $ 11,387 $ 8,950
Amortization of intangible assets   587 607 1,751 1,822
Acquisition-related integration costs   57 111 196 365
(Gain) loss on sale of subsidiary   (271) 205 (271) 205
Store rationalization charges   0 96 0 231
Adjusted operating income (loss)   3,622 $ 3,947 13,063 11,573
Proceeds from sale of subsidiary       834 $ 0
Retail/ LTC          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Number of under performing stores | store     22   22
Health Care Benefits | Discontinued Operations, Disposed of by Sale | Coventry Health Care Workers Compensation business          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
(Gain) loss on sale of subsidiary   $ (271)   $ (271)  
Proceeds from sale of subsidiary $ 850        
Pharmacy Services          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Number of under performing stores | store         46