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Debt - Short-term and Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Short-term debt [Abstract]          
Commercial paper $ 944   $ 944 $ 1,500  
Other, including finance leases 27   27 117  
Total short-term debt 5,514   5,514 2,955  
Long-term uncollateralized debt [Abstract]          
Other, including finance leases 61   61 32  
Total long-term debt 31,893   31,893 39,523  
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
Commercial Paper [Member]          
Short-term debt [Abstract]          
Weighted average interest rate, commercial paper 2.11%   2.11%    
2.25% Senior Notes [Member]          
Short-term debt [Abstract]          
Current maturities $ 0   $ 0 995  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,000   $ 1,000    
Long-term debt, stated interest rate 2.25%   2.25%    
7.25% Senior Notes [Member]          
Short-term debt [Abstract]          
Current maturities $ 0   $ 0 343  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 337   $ 337    
Long-term debt, stated interest rate 7.25%   7.25%    
$1,500 million, 4.5% Notes due 2026          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,500   $ 1,500    
Long-term debt, stated interest rate 4.50%   4.50%    
Long-term debt, excluding finance lease obligations $ 1,506   $ 1,506 1,508  
$1,500 million, 3.4% Notes due 2027          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,500   $ 1,500    
Long-term debt, stated interest rate 3.40%   3.40%    
Long-term debt, excluding finance lease obligations $ 1,396   $ 1,396 1,386  
$259 million, 7.875% Debentures due 2027 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 259   $ 259    
Long-term debt, stated interest rate 7.875%   7.875%    
Long-term debt, excluding finance lease obligations $ 259   $ 259 259  
$600 million, 3.05% Notes due 2027 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 600   $ 600    
Long-term debt, stated interest rate 3.05%   3.05%    
Long-term debt, excluding finance lease obligations $ 595   $ 595 595  
$3,800 million, 4.375% Notes due 2028          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 3,800   $ 3,800    
Long-term debt, stated interest rate 4.375%   4.375%    
Long-term debt, excluding finance lease obligations $ 3,776   $ 3,776 3,774  
$45 million, 8.3% Step Down Notes due 2033 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 45   $ 45    
Long-term debt, stated interest rate 8.30%   8.30%    
Long-term debt, excluding finance lease obligations $ 45   $ 45 45  
$190 million, 6.15% Notes due 2036 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 190   $ 190    
Long-term debt, stated interest rate 6.15%   6.15%    
Long-term debt, excluding finance lease obligations $ 190   $ 190 190  
$121 million, 5.875% Notes due 2041 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 121   $ 121    
Long-term debt, stated interest rate 5.875%   5.875%    
Long-term debt, excluding finance lease obligations $ 119   $ 119 119  
$449 million, 6.125% Notes due 2041 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 449   $ 449    
Long-term debt, stated interest rate 6.125%   6.125%    
Long-term debt, excluding finance lease obligations $ 491   $ 491 493  
$317 million, 5.375% Notes due 2042 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 317   $ 317    
Long-term debt, stated interest rate 5.375%   5.375%    
Long-term debt, excluding finance lease obligations $ 315   $ 315 315  
$1,500 million, 4.8% Notes due 2046          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,500   $ 1,500    
Long-term debt, stated interest rate 4.80%   4.80%    
Long-term debt, excluding finance lease obligations $ 1,465   $ 1,465 1,465  
$3,000 million, 4.9% Notes due 2048 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 3,000   $ 3,000    
Long-term debt, stated interest rate 4.90%   4.90%    
Long-term debt, excluding finance lease obligations $ 2,964   $ 2,964 2,964  
$1,000 million, 3.875% Notes due 2047 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,000   $ 1,000    
Long-term debt, stated interest rate 3.875%   3.875%    
Long-term debt, excluding finance lease obligations $ 988   $ 988 988  
$250 million, 4.375% Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 249   249 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 250   $ 250    
Long-term debt, stated interest rate 4.375%   4.375%    
Long-term debt, excluding finance lease obligations $ 0   $ 0 248  
$300 million, 5.125% Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 300   300 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 300   $ 300    
Long-term debt, stated interest rate 5.125%   5.125%    
Long-term debt, excluding finance lease obligations $ 0   $ 0 298  
$349 million, 4.125% Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 351   351 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 349   $ 349 500  
Long-term debt, stated interest rate 4.125%   4.125%    
Long-term debt, excluding finance lease obligations $ 0   $ 0 506  
$500 million, 2.6% Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 496   496 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 500   $ 500    
Long-term debt, stated interest rate 2.60%   2.60%    
Long-term debt, excluding finance lease obligations $ 0   $ 0 493  
$1,750 million, 3.2% Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 1,748   1,748 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,750   $ 1,750    
Long-term debt, stated interest rate 3.20%   3.20%    
Long-term debt, excluding finance lease obligations $ 0   $ 0 1,743  
$400 million, Floating Rate Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 400   400 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value 400   400    
Long-term debt, excluding finance lease obligations 0   0 399  
$1,000 million, Floating Rate Notes due 2020 [Member]          
Short-term debt [Abstract]          
Current maturities 999   999 0  
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value 1,000   1,000    
Long-term debt, excluding finance lease obligations 0   0 997  
$3,000 million Floating Rate Term Loan due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value 3,000   3,000    
Long-term debt, excluding finance lease obligations 0   0 2,997  
$500 million, 3.3% Notes due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 500   $ 500    
Long-term debt, stated interest rate 3.30%   3.30%    
Long-term debt, excluding finance lease obligations $ 499   $ 499 499  
$300 million, 4.5% Notes due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 300   $ 300    
Long-term debt, stated interest rate 4.50%   4.50%    
Long-term debt, excluding finance lease obligations $ 298   $ 298 297  
$78 million, 6.37% Notes due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 78   $ 78    
Long-term debt, stated interest rate 6.37%   6.37%    
Long-term debt, excluding finance lease obligations $ 78   $ 78 78  
$1,000 million, Floating Rate Notes due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value 1,000   1,000    
Long-term debt, excluding finance lease obligations 998   998 996  
$1,250 million, 3.4% Notes due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,250   $ 1,250    
Long-term debt, stated interest rate 3.40%   3.40%    
Long-term debt, excluding finance lease obligations $ 1,247   $ 1,247 1,245  
$1,248 million, 4.75% Notes due 2021 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,248   $ 1,248    
Long-term debt, stated interest rate 4.75%   4.75%    
Long-term debt, excluding finance lease obligations $ 1,272   $ 1,272 1,285  
$750 million, 4% Notes due 2022 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 750   $ 750    
Long-term debt, stated interest rate 4.00%   4.00%    
Long-term debt, excluding finance lease obligations $ 747   $ 747 746  
$999 million, 3.9% Notes due 2022 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 999   $ 999    
Long-term debt, stated interest rate 3.90%   3.90%    
Long-term debt, excluding finance lease obligations $ 999   $ 999 998  
$500 million, 3.05% Notes due 2022 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 500   $ 500    
Long-term debt, stated interest rate 3.05%   3.05%    
Long-term debt, excluding finance lease obligations $ 485   $ 485 481  
$17 million, 8.3% Notes due 2023 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 17   $ 17    
Long-term debt, stated interest rate 8.30%   8.30%    
Long-term debt, excluding finance lease obligations $ 17   $ 17 17  
$100 million, 7.65% Notes due 2023 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 100   $ 100    
Long-term debt, stated interest rate 7.65%   7.65%    
Long-term debt, excluding finance lease obligations $ 100   $ 100 100  
$700 million, Floating Rate Notes due 2023 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value 700   700    
Long-term debt, excluding finance lease obligations 698   698 697  
$3,100 million, 3.75% Notes due 2023 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 3,100   $ 3,100    
Long-term debt, stated interest rate 3.75%   3.75%    
Long-term debt, excluding finance lease obligations $ 3,088   $ 3,088 3,085  
$1,000 million, 3% Notes due 2023 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,000   $ 1,000    
Long-term debt, stated interest rate 3.00%   3.00%    
Long-term debt, excluding finance lease obligations $ 966   $ 966 959  
$900 million, 3.25% Notes Due 2025 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 900   $ 900    
Long-term debt, stated interest rate 3.25%   3.25%    
Long-term debt, excluding finance lease obligations $ 895   $ 895 895  
$2,200 million, 4.125% Notes due 2025 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 2,200   $ 2,200    
Long-term debt, stated interest rate 4.125%   4.125%    
Long-term debt, excluding finance lease obligations $ 2,188   $ 2,188 2,187  
$1,000 million, 3.5% Notes due 2024 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 1,000   $ 1,000    
Long-term debt, stated interest rate 3.50%   3.50%    
Long-term debt, excluding finance lease obligations $ 970   $ 970 966  
$2,200 million, 4.8% Notes due 2038 [Member]          
Long-term uncollateralized debt [Abstract]          
Long-term debt, face value $ 2,200   $ 2,200    
Long-term debt, stated interest rate 4.80%   4.80%    
Long-term debt, excluding finance lease obligations $ 2,178   $ 2,178 $ 2,178  
Notes issued in 2018 in connection with Express Scripts Merger [Member] | Commercial Paper [Member]          
Long-term uncollateralized debt [Abstract]          
Net proceeds on issuance of long-term debt   $ 20,000