Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Oct. 29, 2007 2007 Program [Member]	Dec. 31, 2013 2007 Program [Member]	Dec. 16, 2013 2013 Program [Member]	Dec. 31, 2013 2013 Program [Member]
Equity, Class of Treasury Stock [Line Items]
Amount approved to repurchase, shares, maximum			$ 7,000		$ 10,000
Amount approved to repurchase, shares, remaining				$ 810		$ 10,000
Common stock, shares authorized	1,200,000,000	1,200,000,000
Preferred shares, authorized	20,000,000	20,000,000