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Schedule I - Condensed Financial Information, Short-term and Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Repayment of long-term debt     $ 4,491 $ 131 $ 1,250
Notes issued by Express Scripts, Medco and Old Cigna exchanged for Notes issued by Cigna $ 12,700        
Net proceeds on issuance of long-term debt     0 22,856 1,581
Maturities Of Debt Excluding Finance Leases [Abstract]          
Scheduled maturities, long-term debt, 2020 4,549   4,549    
Scheduled maturities, long-term debt, 2021 4,376   4,376    
Scheduled maturities, long-term debt, 2022 2,249   2,249    
Scheduled maturities, long-term debt, 2023 4,917   4,917    
Scheduled maturities, long-term debt, 2024 1,000   1,000    
Scheduled maturities, long-term debt, after 2024 19,581   19,581    
$349 million, 4.125% Notes due 2020 [Member]          
Debt Instrument [Line Items]          
Repayment of long-term debt     151    
Long-term debt, face value 349   349 500  
Cigna [Member]          
Debt Instrument [Line Items]          
Repayment of long-term debt     3,002 0  
Notes issued by Express Scripts, Medco and Old Cigna exchanged for Notes issued by Cigna 12,700        
Net proceeds on issuance of long-term debt     0 $ 22,856  
Maturities Of Debt Excluding Finance Leases [Abstract]          
Scheduled maturities, long-term debt, 2020 3,099   3,099    
Scheduled maturities, long-term debt, 2021 3,812   3,812    
Scheduled maturities, long-term debt, 2022 1,770   1,770    
Scheduled maturities, long-term debt, 2023 4,699   4,699    
Scheduled maturities, long-term debt, 2024 714   714    
Scheduled maturities, long-term debt, after 2024 18,638   18,638    
Cigna [Member] | Notes issued in 2018 in connection with Express Scripts Merger [Member]          
Debt Instrument [Line Items]          
Net proceeds on issuance of long-term debt   $ 20,000      
Cigna [Member] | $349 million, 4.125% Notes due 2020 [Member]          
Debt Instrument [Line Items]          
Repayment of long-term debt     3,000    
Long-term debt, face value $ 3,000   $ 3,000    
Old Cigna [Member]          
Debt Instrument [Line Items]          
Repayment of long-term debt         1,250
Net proceeds on issuance of long-term debt         $ 1,581