Debt Textuals (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Fees to maintain credit lines	$ 4,900,000	$ 2,500,000
Minimum fixed charge coverage ratio	1.25
Line of credit facility financial covenants combined earnings and fixed charges to fixed charges ratio actual	1.54
Total interest paid on short and long term debt	$ 500,000,000	600,000,000	$ 500,000,000
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