Stockholders' Equity (Share Repurchase Program) (Narrative) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended			1 Months Ended		132 Months Ended	1 Months Ended	33 Months Ended	1 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014 January 2014 Buyback Plan [Member]	Jun. 30, 2001 June 2001 Buyback Plan [Member]	Jun. 30, 2012 June 2001 Buyback Plan [Member]	Apr. 30, 2011 April 2011 Buyback Plan [Member]	Dec. 31, 2013 April 2011 Buyback Plan [Member]	Feb. 28, 2013 December 2012 Buyback Plan [Member]	Dec. 31, 2012 December 2012 Buyback Plan [Member]	Jun. 30, 2013 December 2012 Buyback Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Share buyback plan, authorized amount				$ 5,000	$ 2,000		$ 2,000			$ 1,000
Payments for Repurchase of Common Stock	$ 1,000	$ 400	$ 672					$ 284	$ 1,000
Repurchased and retired, shares	20,400	7,778	13,837			42,000		5,500			20,400