Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v3.22.0.1
Assets and Liabilities Measured at Fair Value (Details)
shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Mar. 09, 2020
USD ($)
$ / item
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Repayments of long term debt       $ 1,052 $ 359
Exchangeable Senior Debentures due 2051          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Margin     0.50%    
Forward Contracts | variable prepaid forward          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Forward contract shares indexed | shares 2.4        
Forward floor price | $ / item 17.25        
Forward cap price | $ / item 26.84        
Variable prepaid forward prepayment received $ 34 $ 34      
Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash equivalents     $ 35 4  
Recurring | Exchangeable Senior Debentures due 2051          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative asset     268    
Recurring | Financial instrument liabilities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative asset     85 14  
Recurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash equivalents     35 4  
Recurring | Level 2 | Exchangeable Senior Debentures due 2051          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative asset     268    
Recurring | Level 2 | Financial instrument liabilities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative asset     $ 85 $ 14