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DEBT - Senior Notes (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2014
Sep. 30, 2017
Dec. 31, 2016
Mar. 31, 2017
Dec. 31, 2015
Debt          
Outstanding borrowings   $ 5,139 $ 5,268    
Senior Notes (Unsecured)          
Debt          
Principal amount of debt reduction through payment or repurchase     1,500    
Repurchase value of the principal amounts     $ 750    
Aggregate principal amount issued $ 5,000        
Net proceeds from issuance of senior notes used to make cash distribution to Occidental $ 4,950        
Number of common stock shares exchanged to pay down unsecured senior notes     3.4    
Debt reduction from exchange of common stock shares     $ 100    
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          
Interest rate (as a percent) 5.00% 5.00% 5.00%    
Outstanding borrowings   $ 165 $ 193    
Principal amount of debt reduction through payment or repurchase       $ 28 $ 33
Repurchase value of the principal amounts       $ 24 $ 13
Aggregate principal amount issued $ 1,000        
Senior Notes (Unsecured) | 5.5% Notes Due 2021          
Debt          
Interest rate (as a percent) 5.50% 5.50% 5.50%    
Outstanding borrowings   $ 135 $ 135    
Aggregate principal amount issued $ 1,750        
Senior Notes (Unsecured) | 6% Notes Due 2024          
Debt          
Interest rate (as a percent) 6.00% 6.00% 6.00%    
Outstanding borrowings   $ 193 $ 193    
Aggregate principal amount issued $ 2,250