Dividend and Share Repurchase (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Supplemental Cash Flow Elements [Abstract]
Return of capital to shareholders	$ 2,750,000,000			$ 1,000,000,000
Dividends Payable, Date Declared	Apr. 25, 2014
Cash Dividends Declared Per Share	$ 0.06		$ 0	$ 0.12	$ 0
Dividends Payable, Date of Record	May 09, 2014
Dividends Payable, Date to be Paid	May 30, 2014
Dividends, Common Stock, Cash	50,000,000	51,000,000		101,000,000
Stock Repurchase Program, Authorized Amount	2,000,000,000			500,000,000
Share repurchase program, completion date	Dec. 31, 2016			Jun. 30, 2016
Stock Repurchased and Retired During Period, Shares	2.5			7.3
Stock Repurchased and Retired During Period, Value	100,000,000			250,000,000
Stock repurchase program, total value repurchased and retired to date				$ 500,000,000
Common Stock, Dividends, Per Share, Approved	$ 0.09