Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

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Debt - Schedule of Debt (Details) - USD ($)
Jun. 30, 2020
May 31, 2020
Feb. 29, 2020
Jan. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Fair value of interest rate swap agreements $ 0       $ (1,000,000)
Total senior notes 15,066,000,000       12,010,000,000
Mortgage notes payable 52,000,000       54,000,000
Construction loan payable 165,000,000       140,000,000
Finance leases and other 139,000,000       122,000,000
Debt issuance costs (147,000,000)       (143,000,000)
Total debt 16,814,000,000       13,726,000,000
Less current portion (106,000,000)       (88,000,000)
Long-term debt 16,708,000,000       13,638,000,000
Revolving credit agreement          
Debt Instrument [Line Items]          
Revolving credit agreement 89,000,000       93,000,000
Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount     $ 2,100,000,000    
Term loan credit facility          
Debt Instrument [Line Items]          
Revolving credit agreement 1,450,000,000       1,450,000,000
$1,000 million 4.75% Senior Notes, due May 15, 2022 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 1,000,000,000        
Interest rate 4.75%     4.75%  
Senior notes $ 1,005,000,000       1,004,000,000
$1,000 million 6.125% Senior Notes, due February 15, 2024 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 1,000,000,000   $ 1,000,000,000    
Interest rate 6.125%   6.125%    
Senior notes $ 0       1,000,000,000
$2,200 million 4.75% Senior Notes, due January 15, 2025 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 2,200,000,000   $ 2,200,000,000    
Interest rate 4.75%   4.75%    
Senior notes $ 2,234,000,000       2,228,000,000
$1,200 million 5.250% Senior Notes due April 1, 2025 | Senior Notes          
Debt Instrument [Line Items]          
Senior notes 1,248,000,000       0
$1,800 million 5.375% Senior Notes, due June 1, 2026 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 1,800,000,000        
Interest rate 5.375%        
Senior notes $ 1,800,000,000       1,800,000,000
$2,500 million 4.25% Senior Notes due December 15, 2027 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 2,500,000 $ 2,500,000,000      
Interest rate 4.25% 4.25%      
Senior notes $ 2,481,000,000       2,479,000,000
$3,500 million 4.625% Senior Notes due December 15, 2029 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 3,500,000 $ 3,500,000,000      
Interest rate 4.625% 4.625%      
Senior notes $ 3,500,000,000       3,500,000,000
$2,000 million 3.375% Senior Notes due February 15, 2030 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 2,000,000 $ 2,000,000,000 $ 2,000,000,000    
Interest rate 3.375% 3.375% 3.375%    
Senior notes $ 2,000,000,000       0
WellCare Health Plans, Inc. | $1,200 million 5.250% Senior Notes due April 1, 2025 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount       $ 1,200,000,000  
Interest rate       5.25%  
WellCare Health Plans, Inc. | $750 million 5.375% Senior Notes due August 15, 2026 | Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount $ 750,000     $ 750,000,000  
Interest rate 5.375%     5.375%  
Senior notes $ 798,000,000       $ 0