Equity (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Under June 2012 Board Of Directors Authorization [Member]	Jun. 30, 2013 Under June 2012 Board Of Directors Authorization [Member]	Jun. 30, 2013 Under June 2013 Board Of Directors Authorization [Member]	Jun. 30, 2013 Common Stock [Member] Under June 2012 Board Of Directors Authorization [Member]
Amount of Stock Repurchases Authorized by the Board of Directors			$ 1,000,000,000		$ 1,000,000,000
Number of Treasury Stock Shares Acquired						6.6
Cost of Treasury Stock Acquired	$ 237,000,000	$ 500,000,000		$ 400,000,000