Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Debt) (Details)

v3.21.1
Long-Term Debt (Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Jul. 01, 2019
Debt Instrument [Line Items]      
Derivative, Notional Amount     $ 125
Debt and Lease Obligation $ 161 $ 168  
Debt Issuance Costs (47) (50)  
Total debt and finance lease obligations 5,003 4,959  
Less current portion (458) (410)  
Long-term portion of debt and finance lease obligations $ 4,545 4,549  
Exchangeable Senior Debentures Due 2031      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.50%    
Debt Instrument Net of Unamortized Discounts Premium $ 441 393  
4.375% Senior Secured Notes due 2023, net of original issue discount      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.375%    
Debt Instrument Net of Unamortized Discounts Premium $ 750 750  
4.85% Senior Secured Notes due 2024, net of original issue discount      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.85%    
Debt Instrument Net of Unamortized Discounts Premium $ 600 600  
4.45% Senior Secured Notes due 2025, net of original issue discount      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.45%    
Debt Instrument Net of Unamortized Discounts Premium $ 599 599  
4.75% Senior Secured Notes      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.75%    
Debt Instrument Net of Unamortized Discounts Premium $ 575 575  
4.375% Senior Secured Notes due 2028      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.375%    
Debt Instrument Net of Unamortized Discounts Premium $ 500 500  
5.45% Senior Secured Notes due 2034, net of original issue discount      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.45%    
Debt Instrument Net of Unamortized Discounts Premium $ 399 399  
5.95% Senior Secured Notes due 2043, net of original issue discount      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.95%    
Debt Instrument Net of Unamortized Discounts Premium $ 300 300  
6.375% Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.375%    
Debt Instrument Net of Unamortized Discounts Premium $ 225 225  
6.25% Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.25%    
Debt Instrument Net of Unamortized Discounts Premium $ 500 500  
Finance lease obligations (note 6)      
Debt Instrument [Line Items]      
Debt and Lease Obligation $ 161 $ 168