Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

v3.20.1
Debt - Schedule of Debt (Details) - USD ($)
Mar. 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 15,073,000,000     12,010,000,000
Mortgage notes payable 53,000,000     54,000,000
Construction loan payable 149,000,000     140,000,000
Finance leases and other 119,000,000     122,000,000
Debt issuance costs (153,000,000)     (143,000,000)
Total debt 17,279,000,000     13,726,000,000
Less current portion (129,000,000)     (88,000,000)
Long-term debt 17,150,000,000     13,638,000,000
Revolving credit agreement        
Debt Instrument [Line Items]        
Revolving credit agreement 588,000,000     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 $ 1,007,000,000     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    
Interest rate   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      
Interest rate 4.75%      
Senior notes $ 2,236,000,000     2,228,000,000
$1,200 million 5.250% Senior Notes due April 1, 2025 | Senior Notes        
Debt Instrument [Line Items]        
Senior notes 1,250,000,000     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      
Interest rate 4.25%      
Senior notes $ 2,480,000,000     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      
Interest rate 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    
Interest rate 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 $ 800,000,000     $ 0