Shareholders' Equity - Share-based Compensation, Awards, Unrecognized Compensation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards, Unrecognzied Compensation		$ 84
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards, Unrecognzied Compensation		60
Awards Compensation Costs Remaining Weighted Average Term	1 year 4 months
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards, Unrecognzied Compensation		20
Awards Compensation Costs Remaining Weighted Average Term	1 year 4 months
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards, Unrecognzied Compensation		$ 4
Awards Compensation Costs Remaining Weighted Average Term	7 months