Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.20.1
Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Feb. 29, 2020
USD ($)
Mar. 31, 2020
USD ($)
derivative
Mar. 31, 2019
USD ($)
Jan. 31, 2020
USD ($)
Jan. 23, 2020
USD ($)
Debt Instrument [Line Items]          
Loss on extinguishment of debt $ 44,000,000 $ 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 2,100,000,000      
Senior Notes          
Debt Instrument [Line Items]          
Debt, face amount   2,100,000,000      
Senior Notes | 3.375% Senior Notes Due 2030          
Debt Instrument [Line Items]          
Debt, face amount $ 2,000,000,000 $ 2,000,000      
Interest rate 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        
Interest rate 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      
Interest rate   4.75%   4.75%  
Debt redemption amount       $ 1,000,000,000  
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   $ 750,000,000  
Interest rate   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 | $2,200 million 4.75% Senior Notes, due January 15, 2025          
Debt Instrument [Line Items]          
Debt, face amount   $ 2,200,000,000      
Interest rate   4.75%