Shareholders' Equity Repurchase Activity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	2 Months Ended	3 Months Ended
	Sep. 30, 2013	Mar. 31, 2014	Mar. 31, 2013
Repurchase Activity [Abstract]
Treasury Stock Acquired, Average Cost Per Share		$ 55.88
Number of shares repurchased		8.9
Shares repurchased		$ (500,000,000)	$ (50,000,000)
Stock Repurchase Program, Remaining Authorized Repurchase Amount	1,200,000,000
Treasury Stock Shares Acquired From Inception		197
Treasury Stock Value Acquired Cost Method From Inception		$ 8,100,000,000