Other Expenses (Details) (USD $) In Millions	3 Months Ended
Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010
Other Expenses (Textuals)
Other operating expenses	$ 420	$ 774	$ 538
Pre operational expenses	$ 132	$ 471	$ 228

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 3
-Article 5

Name:	us-gaap_OtherCostAndExpenseOperating
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration