Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.20.2
Debt - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2020
USD ($)
derivative
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
May 31, 2020
USD ($)
Jan. 31, 2020
USD ($)
Jan. 23, 2020
USD ($)
Debt Instrument [Line Items]                
Loss on extinguishment of debt $ 44,000,000 $ 0 $ 0 $ 44,000,000 $ 0      
Number of Interest rate swap contracts terminated | derivative 3              
Proceeds from termination of interest rate swaps $ 9,000,000              
WellCare Health Plans, Inc.                
Debt Instrument [Line Items]                
Acquisition of WellCare Notes               $ 2,055,000,000
Interest Rate Swap                
Debt Instrument [Line Items]                
Derivative notional amount 1,000,000,000              
Interest Rate Contracts- Swap                
Debt Instrument [Line Items]                
Derivative notional amount 2,100,000,000              
Senior Notes                
Debt Instrument [Line Items]                
Debt, face amount 2,100,000,000              
Senior Notes | $1,200 Million Senior Notes Due April 2025 | WellCare Health Plans, Inc.                
Debt Instrument [Line Items]                
Debt, face amount             $ 1,200,000,000  
Interest rate             5.25%  
Senior Notes | $750 million 5.375% Senior Notes due August 15, 2026 | WellCare Health Plans, Inc.                
Debt Instrument [Line Items]                
Debt, face amount   $ 750,000   $ 750,000     $ 750,000,000  
Interest rate   5.375%   5.375%     5.375%  
Senior Notes | $1,146 Million 5.25% Senior Notes Due 2025 | WellCare Health Plans, Inc.                
Debt Instrument [Line Items]                
Debt, face amount             $ 1,146,000,000  
Interest rate             5.25%  
Senior Notes | 5.375% Senior Notes Due 2026 | WellCare Health Plans, Inc.                
Debt Instrument [Line Items]                
Debt, face amount             $ 747,000,000  
Interest rate             5.375%  
Senior Notes | 3.375% Senior Notes Due 2030                
Debt Instrument [Line Items]                
Debt, face amount $ 2,000,000,000 $ 2,000,000   $ 2,000,000   $ 2,000,000,000    
Interest rate 3.375% 3.375%   3.375%   3.375%    
Senior Notes | $1,000 million 6.125% Senior Notes, due February 15, 2024                
Debt Instrument [Line Items]                
Debt, face amount $ 1,000,000,000 $ 1,000,000,000   $ 1,000,000,000        
Interest rate 6.125% 6.125%   6.125%        
Senior Notes | $1,000 million 4.75% Senior Notes, due May 15, 2022                
Debt Instrument [Line Items]                
Debt, face amount   $ 1,000,000,000   $ 1,000,000,000        
Interest rate   4.75%   4.75%     4.75%  
Debt redemption amount             $ 1,000,000,000  
Senior Notes | $1,000 million 4.75% Senior Notes due January 15, 2025                
Debt Instrument [Line Items]                
Debt, face amount           $ 1,000,000,000    
Interest rate           4.75%    
Senior Notes | $2,500 million 4.25% Senior Notes due December 15, 2027                
Debt Instrument [Line Items]                
Debt, face amount   $ 2,500,000   $ 2,500,000   $ 2,500,000,000    
Interest rate   4.25%   4.25%   4.25%    
Senior Notes | $3,500 million 4.625% Senior Notes due December 15, 2029                
Debt Instrument [Line Items]                
Debt, face amount   $ 3,500,000   $ 3,500,000   $ 3,500,000,000    
Interest rate   4.625%   4.625%   4.625%    
Senior Notes | $2,200 million 4.75% Senior Notes, due January 15, 2025                
Debt Instrument [Line Items]                
Debt, face amount $ 2,200,000,000 $ 2,200,000,000   $ 2,200,000,000        
Interest rate 4.75% 4.75%   4.75%