Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.21.2
Debt - Narrative (Details)
£ in Millions
1 Months Ended 6 Months Ended 9 Months Ended
Aug. 31, 2021
USD ($)
Jul. 31, 2021
GBP (£)
Apr. 30, 2021
Feb. 28, 2021
USD ($)
Jan. 31, 2021
USD ($)
Oct. 31, 2017
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jul. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                      
Loss on extinguishment of debt $ 79,000,000     $ 46,000,000       $ (125,000,000) $ (44,000,000)    
Payments for foreign currency hedge | £   £ 509                  
Extension term     1 year                
Construction loan payable               188,000,000     $ 180,000,000
Repayment of mortgage note         $ 50,000,000            
Debt Instrument, Payment Period, One                      
Debt Instrument [Line Items]                      
Interest rate 0.00%                    
Debt Instrument, Payment Period, Two                      
Debt Instrument [Line Items]                      
Interest rate 2.50%                    
Debt Instrument, Payment Period, Three                      
Debt Instrument [Line Items]                      
Interest rate 5.00%                    
Foreign currency swap agreement                      
Debt Instrument [Line Items]                      
Derivative agreement                   $ 705,000,000  
Fair value, swap agreement               18,000,000      
Circle Health                      
Debt Instrument [Line Items]                      
Acquisition, interests acquired                   60.00%  
Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount $ 1,800,000,000                    
Construction Loan Payable                      
Debt Instrument [Line Items]                      
Debt, face amount           $ 200,000,000          
Construction Loan Payable | Maximum | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate           2.70%          
Construction Loan Payable | Minimum | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate   2.00%                  
Mortgage Notes Payable                      
Debt Instrument [Line Items]                      
Interest rate                     5.14%
$2,200 million 2.50% Senior Notes due March 1, 2031 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount       $ 2,200,000,000       $ 2,200,000,000      
Interest rate       2.50%       2.50%      
$2,200 million 4.75% Senior Notes, due 2025 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount       $ 2,200,000,000       $ 2,200,000,000      
Interest rate       4.75%       4.75%      
Notes accepted for Tender Offer, principal outstanding, percentage       36.00%              
$1,800 Million 2.45% Senior Notes due March 2028 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount $ 500,000,000                 $ 1,800,000,000  
Interest rate                   2.45%  
Yield, percentage 2.31%                    
$1,300 million 2.625% Senior Notes due August 1, 2031 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount $ 1,300,000,000             $ 1,300,000,000      
Interest rate 2.625%             2.625%      
$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%             5.375%      
Term loan facility                      
Debt Instrument [Line Items]                      
Credit facility, maximum borrowing capacity $ 2,200,000,000           $ 1,450,000,000        
Covenant, maximum net leverage ratio, 4.00           3.50        
Term loan facility | Maximum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 1.50%                    
Term loan facility | Minimum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 1.125%