Shareholders Equity (Details 2) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Treasury Stock [Roll Forward]
Treasury Stock, Shares, Beginning (shares)	22,001
Treasury Stock, Shares, Ending (shares)	19,012
Treasury Stock, Value, Beginning	$ 252
Purchases	730		172
Cancellation of treasury stock	0		0
Treasury Stock, Value, Ending	252
Treasury Stock
Treasury Stock [Roll Forward]
Treasury Stock, Shares, Beginning (shares)	22,001
Purchases (in shares)	60,926	[1]
Cancellations (in shares)	(63,915)
Treasury Stock, Shares, Ending (shares)	19,012
Treasury Stock, Value, Beginning	252
Purchases	730	[1]	172
Cancellation of treasury stock	(730)		(114)
Treasury Stock, Value, Ending	$ 252

[1] Includes associated fees.