Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 152,590	$ 143,615
Income Taxes, Net of Refunds Received		69,281	330,476
Interest Costs Capitalized		33,000	43,000
Accrued Capital Expenditures		$ 437,000	$ 960,000

[1] Net of capitalized interest of $33 million and $43 million for the nine months ended September 30, 2015 and 2014, respectively.