Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 154,852	$ 172,076
Income Taxes, Net of Refunds Received		(314,689)	81,059
Interest Costs Capitalized		28,000	18,000
Accrued Capital Expenditures		568,000	702,000
Non-Cash Property Exchanges		$ 85,000	222,000
Non-Cash Investing From Other Property, Plant and Equipment			$ 49,000

[1] Net of capitalized interest of $28 million and $18 million for the nine months ended September 30, 2019 and 2018, respectively.