Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax (Narrative Details) [Abstract]
Effective Income Tax Rate, Continuing Operations	35.50%	32.20%	35.50%	34.10%
Cash Payment for Federal taxes and Interest		$ 456
Increase Decrease In Effective Tax Rate	3.3		1.4
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	$ 130		$ 130