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Debt Textuals (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Fees to maintain credit lines $ 2,500,000 $ 4,900,000  
Ratio of combined earnings and fixed earnings to fixed charges required to maintain availability of credit line 1.25    
Actual ratio of combined earnings and fixed earnings to fixed charges required to maintain availability of credit line 2.17    
Total interest paid on short and long term debt $ 200,000,000 500,000,000 $ 600,000,000
Long-term Debt [Member]      
Debt Instrument [Line Items]      
Total bank lines of credit of the company 3,500,000,000 3,500,000,000  
Unutilized total credit lines $ 3,500,000,000 $ 3,500,000,000