Stock Benefit Plans (Summary Of The Status Of Restricted Stock Unit And Performance Unit Awards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Non-vested balance at January 1, 2011 (Shares)	73,900
Granted (Shares)	0
Vested (Shares)	22,200
Forfeited (Shares)	0
Non-vested balance at December 31, 2011 (Shares)	51,700
Non-vested balance at January 1, 2011 (Weighted Average Grant Date Fair Value)	$ 41.41
Granted (Weighted Average Grant Date Fair Value)	$ 0.00
Vested (Weighted Average Grant Date Fair Value)	$ 28.74
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 0.00
Non-vested balance at December 31, 2011 (Weighted Average Grant Date Fair Value)	$ 46.86
Performance Units [Member]
Non-vested balance at January 1, 2011 (Shares)	0
Granted (Shares)	390,771
Vested (Shares)	2,809
Forfeited (Shares)	19,616
Non-vested balance at December 31, 2011 (Shares)	368,346
Non-vested balance at January 1, 2011 (Weighted Average Grant Date Fair Value)	$ 0.00
Granted (Weighted Average Grant Date Fair Value)	$ 30.60
Vested (Weighted Average Grant Date Fair Value)	$ 30.60
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 30.60
Non-vested balance at December 31, 2011 (Weighted Average Grant Date Fair Value)	$ 30.60
Restricted Stock Units (RSUs) [Member]
Non-vested balance at January 1, 2011 (Shares)	18,749,101
Granted (Shares)	5,549,028
Vested (Shares)	8,465,116
Forfeited (Shares)	774,585
Non-vested balance at December 31, 2011 (Shares)	15,058,428
Non-vested balance at January 1, 2011 (Weighted Average Grant Date Fair Value)	$ 22.91
Granted (Weighted Average Grant Date Fair Value)	$ 30.46
Vested (Weighted Average Grant Date Fair Value)	$ 23.16
Forfeited Granted (Weighted Average Grant Date Fair Value)	$ 25.12
Non-vested balance at December 31, 2011 (Weighted Average Grant Date Fair Value)	$ 25.43