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Held for Sale - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Nov. 01, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets held for sale $ 15     $ 15   $ 906  
Liabilities held for sale 14     14   683  
WBA Joint Venture              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Noncontrolling interest (percent)             30.00%
Joint Venture | German Pharmaceutical Wholesale Business              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Carrying value of interest in joint venture 0     0      
German Wholesale Business              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Consideration receivable             $ 43
Proceeds from sale of German wholesale business 291            
Pre-tax loss on sale of business 47     57      
After-tax loss on sale of business 47            
Held-for-sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets held for sale 15     15   906  
Liabilities held for sale $ 14     $ 14   683  
Held-for-sale | German Wholesale Business              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Assets held for sale           842  
Liabilities held for sale           656  
Assets held for sale             0
Liabilities held for sale             $ 0
Favorable (unfavorable) cumulative foreign currency translation adjustment           $ 3  
Disposed of by sale | German Wholesale Business              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Impairment   $ 282 $ 10   $ 282    
Impairment, after tax   $ 282 $ 10   $ 282