Share-based Compensation (Details 8) (Performance Stock Units, USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Performance Stock Units
Equity Instruments Other than Options, Nonvested, Number of Shares
Balance at the beginning at the period (in shares)	350,739,000
Granted (in shares)	281,030,000
Forfeited (in shares)	(17,019,000)
Balance at the end at the period (in shares)	614,750,000
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Balance at the beginning at the period (in dollars per share)	$ 24.86
Granted (in dollars per share)	$ 32.63	$ 45.37
Forfeited (in dollars per share)	$ 24.70
Balance at the end at the period (in dollars per share)	$ 24.61