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Debt - Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Apr. 01, 2021
Mar. 08, 2021
Jan. 15, 2021
Dec. 31, 2020
Debt Instrument [Line Items]          
Long-term debt $ 3,649       $ 3,524
Finance Leases and Financing Obligations 137       139
Other 4       5
Total Long-Term Debt 3,786       3,663
Less: Current Portion 18       494
Total Long-Term Debt Excluding Current Portion 3,768       3,169
Less: Unamortized Deferred Debt Issuance Costs 26       22
Total 3,742       3,147
Senior Notes with interest payable semi-annually at 4.75%(b)          
Debt Instrument [Line Items]          
Stated interest rate       4.75%  
Senior Secured Term Loan A-2 Facility          
Debt Instrument [Line Items]          
Stated interest rate       2.67%  
Senior Notes | Senior Notes with interest payable semi-annually at 0.821%, effective rate of 0.83%, payable in 2024(a)          
Debt Instrument [Line Items]          
Long-term debt $ 400       0
Stated interest rate 0.821%   0.821%    
Effective interest rate 0.83%        
Senior Notes | Senior Notes with interest payable semi-annually at 1.512%, effective rate of 1.52%, payable in 2026(a)          
Debt Instrument [Line Items]          
Long-term debt $ 400       0
Stated interest rate 1.512%   1.512%    
Effective interest rate 1.52%        
Senior Notes | Senior Notes with interest payable semi-annually at 3.50%, effective rate of 3.55%, payable in 2029(a)          
Debt Instrument [Line Items]          
Long-term debt $ 350       350
Stated interest rate 3.50%        
Effective interest rate 3.55%        
Senior Notes | Senior Notes with interest payable semi-annually at 3.50%, effective rate of 3.55%, payable in 2028(a)          
Debt Instrument [Line Items]          
Long-term debt $ 450       450
Stated interest rate 3.50%        
Effective interest rate 3.55%        
Senior Notes | Senior Notes with interest payable semi-annually at 4.75%, effective rate of 4.81%, payable in 2027(a)          
Debt Instrument [Line Items]          
Long-term debt $ 300       300
Stated interest rate 4.75%        
Effective interest rate 4.81%        
Senior Notes | Senior Notes with interest payable semi-annually at 4.125%, effective rate of 4.15%, payable in 2024(b)          
Debt Instrument [Line Items]          
Long-term debt $ 300       300
Stated interest rate 4.125%        
Effective interest rate 4.15%        
Senior Notes | Senior Notes with interest payable semi-annually at 4.875%, effective rate of 4.89%, payable in 2022(b)          
Debt Instrument [Line Items]          
Long-term debt $ 250       250
Stated interest rate 4.875%        
Effective interest rate 4.89%        
Senior Notes | Senior Notes with interest payable semi-annually at 4.75%(b)          
Debt Instrument [Line Items]          
Long-term debt $ 0       425
Stated interest rate 4.75%        
Term Loan          
Debt Instrument [Line Items]          
Long-term debt $ 550       1,360
Interest rate at period end 1.59%        
Term Loan | Senior Secured Term Loan A-2 Facility          
Debt Instrument [Line Items]          
Long-term debt $ 425       0
Stated interest rate 2.67%        
Effective interest rate 2.68%        
Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term debt $ 220       $ 84
Effective interest rate 1.57%       2.06%
Interest rate at period end 1.59%        
Revolving Credit Facility | Senior Secured Term Loan A-2 Facility          
Debt Instrument [Line Items]          
Stated interest rate   2.67%