Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Supplemental Cash Flow Information [Line Items]
Interest Paid, Capitalized	$ 18		$ 37		$ 30
Interest Paid, Net	333		393		433
Income Taxes Paid, Net	(27)		8		1
Continuing Operations
Supplemental Cash Flow Information [Line Items]
Interest Paid, Capitalized	18		20		17
Interest Paid, Net	333	[1]	362	[1]	384	[1]
Income Taxes Paid, Net	(41)		116		10
Discontinued Operations
Supplemental Cash Flow Information [Line Items]
Interest Paid, Capitalized	0		17		13
Interest Paid, Net			31	[2]	49	[2]
Income Taxes Paid, Net	$ 14		$ (108)		$ (9)

[1] (a)Net of $18 million, $20 million, and $17 million capitalized, respectively.

[2] (b)Net of $- million, $17 million, and $13 million capitalized, respectively.