Annual report pursuant to Section 13 and 15(d)

Debt - Senior Notes (Details)

v3.19.3.a.u2
Debt - Senior Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 29, 2020
Jan. 31, 2020
Oct. 31, 2019
May 31, 2018
Debt Instrument [Line Items]                
Debt extinguishment costs   $ 30,000,000 $ 0 $ 0        
Senior Notes | $1,000 million 4.75% Senior notes, due 2022                
Debt Instrument [Line Items]                
Face amount $ 1,000,000,000 $ 1,000,000,000            
Interest rate stated, percentage 4.75% 4.75%            
Senior Notes | $1,000 million 6.125% Senior notes, due 2024                
Debt Instrument [Line Items]                
Face amount $ 1,000,000,000 $ 1,000,000,000            
Interest rate stated, percentage 6.125% 6.125%            
Senior Notes | $1,000 million 4.75% Senior notes due 2025                
Debt Instrument [Line Items]                
Face amount $ 1,000,000,000 $ 1,000,000,000            
Interest rate stated, percentage 4.75% 4.75%            
Senior Notes | $2,500 million 4.25% Senior notes due 2027                
Debt Instrument [Line Items]                
Face amount $ 2,500,000,000 $ 2,500,000,000            
Interest rate stated, percentage 4.25% 4.25%            
Senior Notes | $3,500 million 4.625% Senior notes due 2029                
Debt Instrument [Line Items]                
Face amount $ 3,500,000,000 $ 3,500,000,000            
Interest rate stated, percentage 4.625% 4.625%            
Senior Notes | $1,400 million 5.625% Senior notes, due 2021                
Debt Instrument [Line Items]                
Face amount     $ 1,400,000,000          
Interest rate stated, percentage     5.625%       5.625%  
Debt redemption amount             $ 1,400,000,000  
Debt extinguishment costs $ 30,000,000              
Senior Notes | $1,800 million 5.375% Senior notes, due 2026                
Debt Instrument [Line Items]                
Face amount $ 1,800,000,000 $ 1,800,000,000           $ 1,800,000,000
Interest rate stated, percentage 5.375% 5.375%           5.375%
Subsequent Event | Senior Notes | 3.375% Senior Notes Due 2030                
Debt Instrument [Line Items]                
Face amount         $ 2,000,000,000      
Interest rate stated, percentage         3.375%      
Subsequent Event | WellCare | Senior Notes | $1,146 Million 5.25% Senior Notes Due 2025                
Debt Instrument [Line Items]                
Face amount           $ 1,146,000,000    
Interest rate stated, percentage           5.25%    
Subsequent Event | WellCare | Senior Notes | $747 million 5.375% Senior Notes Due 2026                
Debt Instrument [Line Items]                
Face amount           $ 747,000,000    
Interest rate stated, percentage           5.375%    
Subsequent Event | Forecast | Senior Notes | $1,000 million 4.75% Senior notes, due 2022                
Debt Instrument [Line Items]                
Interest rate stated, percentage         4.75%      
Debt redemption amount         $ 1,000,000,000      
Subsequent Event | Forecast | Senior Notes | $1,000 million 6.125% Senior notes, due 2024                
Debt Instrument [Line Items]                
Interest rate stated, percentage         6.125%      
Debt redemption amount         $ 1,000,000,000