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DEBT - Senior Notes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt        
Pre-tax unamortized deferred gain on early extinguishment of debt and deferred issuance costs   $ 126 $ 57 $ 4
Senior Notes (Unsecured)        
Debt        
Aggregate principal amount issued $ 5,000      
Net proceeds from issuance of senior notes used to make cash distribution to Occidental 4,950      
Percentage of principal amount at which notes can be redeemed in case of change control   101.00%    
Percentage of principal amount at which notes can be redeemed prior to their maturity date   100.00%    
Senior Notes (Unsecured) | 5% Notes Due 2020        
Debt        
Aggregate principal amount issued $ 1,000      
Interest rate (as a percent) 5.00% 5.00% 5.00%  
Senior Notes (Unsecured) | 5.5% Notes Due 2021        
Debt        
Aggregate principal amount issued $ 1,750      
Interest rate (as a percent) 5.50% 5.50% 5.50%  
Senior Notes (Unsecured) | 6% Senior Notes due 2024        
Debt        
Aggregate principal amount issued $ 2,250      
Interest rate (as a percent) 6.00% 6.00% 6.00%  
Face value of debt reduction through payment or repurchase     $ 49  
Repurchase value of the principal amounts of senior debt     40  
Pre-tax unamortized deferred gain on early extinguishment of debt and deferred issuance costs     $ 9