Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 221	$ 441	$ 776	$ 749
Unrealized Change in Fair Value	0	0	0	23
Less Tax Provision	0	0	0	(8)
Net Change in Other	3	1	6	4
Other Comprehensive Income	3	1	6	19
Comprehensive Income	$ 224	$ 442	$ 782	$ 768