Business Segment Information (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Segment Information (Textuals) [Abstract]
Operating revenues derived from any customer did not exceed 10% of consolidated revenues	$ 0	$ 0	$ 0	$ 0
Operating revenues from U.S. Operations	11,400,000,000	11,100,000,000	22,500,000,000	22,100,000,000
Percent of Operating revenues from U.S. Operations representative of consolidated operating revenues	67.00%	88.00%	69.00%	87.00%
Prior period reclassifications to conform with current period presentation in connection with reclassifications that affected assets, liabilities and results of operations on a segment basis with no impact to the consolidated results		105,000,000		71,000,000
Prior period reclassifications to conform with current period presentation in connection with reclassifications of income tax amounts that affected assets, liabilities and results of operations on a segment basis with no impact to the consolidated results		56,000,000		38,000,000
Prior period adjustment to consolidated operating earnings		3,000,000		11,000,000
Prior period adjustment to consolidated operating earnings tax expense		$ 2,000,000		$ 6,000,000