Estimates, Significant Accounting Policies and Balance Sheet Detials (Schedule of Property, Plant and Equipment Depreciation and Capitalized Interest Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
ESTIMATES, SIGNIFICANT ACCOUNTING POLICIES AND BALANCE SHEET DETAIL
Depreciation expense(1)	$ 944	[1]	$ 615	[1]	$ 380	[1]
Capitalized interest, excluding AFUDC	$ 43		$ 99		$ 11

[1] (1) Depreciation expense amounts have been adjusted by $26 million for the year ended December 31, 2011 to present Canyon’s operations as discontinued operations.