Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 68,730	$ 108,994
Income Taxes, Net of Refunds Received		(76,489)	(331,778)
Interest Costs Capitalized		17,000	18,000
Accrued Capital Expenditures		246,000	626,000
Non-Cash Property Exchanges		55,000	$ 72,000
Noncash Additions To Other Property, Plant and Equipment		$ 73,000

[1] Net of capitalized interest of $17 million and $18 million for the six months ended June 30, 2020 and 2019, respectively.