Shareholders Equity (Details 2) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Treasury Stock [Roll Forward]
Treasury Stock, Shares, Beginning (shares)	22,001
Treasury Stock, Shares, Ending (shares)	12,081
Treasury Stock, Value, Beginning	$ 252
Purchases	479	10
Cancellation of treasury stock	0	0
Treasury Stock, Value, Ending	148
Treasury Stock
Treasury Stock [Roll Forward]
Treasury Stock, Shares, Beginning (shares)	22,001
Purchases (in shares)	41,915
Cancellations (in shares)	(51,835)
Treasury Stock, Shares, Ending (shares)	12,081
Treasury Stock, Value, Beginning	252
Purchases	479	10
Cancellation of treasury stock	(583)	(114)
Treasury Stock, Value, Ending	$ 148