Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 152,395	$ 154,852
Income Taxes, Net of Refunds Received		(263,215)	(314,689)
Interest Costs Capitalized		24,000	28,000
Accrued Capital Expenditures		244,000	568,000
Non-Cash Property Exchanges		135,000	$ 85,000
Noncash Additions To Other Property, Plant and Equipment		$ 73,000

[1] Net of capitalized interest of $24 million and $28 million for the nine months ended September 30, 2020 and 2019, respectively.