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Acquisition and Assets Held for Sale - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 02, 2023
May 01, 2023
Mar. 29, 2023
Feb. 21, 2023
Feb. 28, 2023
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Business Acquisition [Line Items]                
Proceeds from debt       $ 6,000 $ 6,000      
Loss on assets held for sale           $ 349 $ 41  
Subsequent Event                
Business Acquisition [Line Items]                
Proceeds from debt   $ 5,000            
Signify Health, Inc.                
Business Acquisition [Line Items]                
Percentage of voting interests acquired     100.00%          
Cash to be received by shareholders in proposed acquisition (in dollars per share)     $ 30.50          
Total value of proposed acquisition     $ 7,353          
Goodwill deductible for income tax purposes     1,700          
Deferred income taxes     $ 256          
Transaction costs           37    
Oak Street Health Inc. | Subsequent Event                
Business Acquisition [Line Items]                
Percentage of voting interests acquired 100.00%              
Cash to be received by shareholders in proposed acquisition (in dollars per share) $ 39.00              
Total value of proposed acquisition $ 10,600              
Disposal Group, Held-for-sale, Not Discontinued Operations | Omnicare Long-Term Care Business | Pharmacy & Consumer Wellness                
Business Acquisition [Line Items]                
Loss on assets held for sale           $ 349   $ 2,500