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Debt and Finance Lease Obligations, Other Debt and Other Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Principal Payments Due on Debt      
2021 [1]   $ 603  
2022   6  
2023   1,445  
2024   925  
2025   1,650  
Thereafter   8,474  
Net unamortized debt issuance costs and other   (90) $ (88)
Total debt   13,013 $ 8,881
Credit Facilities [Member] | IEnova Revolver [Member] | Central Mexico Terminals [Member]      
Principal Payments Due on Debt      
2021   $ 598  
Pure Biofuels del Peru S.A.C (Now Known as Valero Peru S.A.C.) [Member]      
Other Debt (Textual)      
Amount of debt retired $ 137    
[1] As of December 31, 2020, our debt obligations due in 2021 include $598 million associated with borrowings under the IEnova Revolver.