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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Income Tax Disclosure [Abstract]          
Income tax expense (benefit) related to continuing operations $ 238 $ (1,189) $ 396 $ (1,011)  
Reported income tax expense (benefit) rates (percent) 85.90% 16.10% 30.90% 16.70%  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Charge for remeasurement to fair value     $ 1,271 $ 0  
Discrete tax benefit recognized due to GILTI $ 42        
Discrete tax benefit recognized due to temporary difference arising from buyer's excess tax basis       105  
Unrecognized tax benefits 1,600   1,600    
Unrecognized tax benefits that would reduce income tax expense and the effective tax rate 1,300   1,300    
Discrete tax benefit recognized due to statute of limitation expirations     115    
National Prescription Opioid Litigation          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Pre-tax expenses related to estimated litigation liability     193   $ 8,100
After-tax expenses related to estimated litigation liability     160 $ 6,700 $ 6,800
European Businesses (Disposal Group)          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Charge for remeasurement to fair value     517    
European Businesses (Disposal Group) | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Charge for remeasurement to fair value 879   1,400    
U.K. and Austrian Businesses (Disposal Group)          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Charge for remeasurement to fair value $ 853   $ 853