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Debt - Narrative (Details) - USD ($)
1 Months Ended
May 31, 2020
Mar. 31, 2020
Dec. 31, 2020
Apr. 30, 2020
Feb. 29, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Restricted cash             $ 88,000,000 $ 88,000,000
Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount       $ 554,000,000        
Loss on extinguishment of debt $ (4,000,000)              
Revolving Credit Facility                
Debt Instrument [Line Items]                
Debt instrument face amount   $ 800,000,000     $ 750,000,000      
Credit agreement term, years   5 years            
Long-term line of credit     $ 0     $ 0    
Senior Notes Due 2050 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount $ 800,000,000              
Debt instrument, interest rate 3.05%              
Net proceeds from issuance of debt $ 790,000,000              
Senior Notes Due 2055 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount $ 800,000,000              
Debt instrument, interest rate 3.155%              
Senior Notes Due 2118 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount       $ 450,000,000        
Debt instrument, interest rate       5.10%        
Senior Notes Due 2111 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount       $ 42,000,000        
Debt instrument, interest rate       6.00%        
Senior Notes Due 2097 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount       $ 29,000,000        
Debt instrument, interest rate       7.90%        
Senior Notes Due 2105 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount       $ 26,000,000        
Debt instrument, interest rate       6.00%        
Senior Notes Due 2037 | Senior Notes                
Debt Instrument [Line Items]                
Debt instrument face amount       $ 7,000,000        
Debt instrument, interest rate       7.05%        
Securitization Borrowings                
Debt Instrument [Line Items]                
Credit agreement       $ 450,000,000        
Accounts receivable securitization balance     0     0    
Available borrowing capacity           $ 429,000,000    
Amended Securitization Borrowings Program                
Debt Instrument [Line Items]                
Credit agreement $ 400,000,000              
Available borrowing capacity     $ 400,000,000