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Share-Based Compensation Plans (Details 3) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance 173,509 64,623 134,389
Granted, Number of Shares 230,096 205,463 2,363
Vested, Number of Shares (95,336) (85,323) (57,926)
Cancelled/forfeited, Number of Shares (68,571) (11,254) (14,203)
Outstanding, Ending Balance 239,698 173,509 64,623
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, beginning balance $ 25.38 $ 11.37 $ 15.95
Granted, Weighted Average Exercise Price $ 26.40 $ 27.37 $ 15.30
Vested, Weighted Average Exercise Price $ 23.15 $ 19.36 $ 21.90
Cancelled/forfeited, Weighted Average Grant Date Fair Value $ 27.43 $ 26.89 $ 12.43
Weighted Average Grant Date Fair Value, Ending Balance $ 26.65 $ 25.38 $ 11.37
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance 45,518 126,416 67,485
Granted, Number of Shares 0 0 91,378
Vested, Number of Shares (31,456) (79,014) (22,500)
Cancelled/forfeited, Number of Shares (2,651) (1,884) (9,947)
Outstanding, Ending Balance 11,411 45,518 126,416
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, beginning balance $ 24.14 $ 27.32 $ 18.06
Granted, Weighted Average Exercise Price $ 0.00   $ 15.40
Vested, Weighted Average Exercise Price $ 25.92 $ 27.87 $ 15.24
Cancelled/forfeited, Weighted Average Grant Date Fair Value $ 24.60 $ 25.03 $ 15.76
Weighted Average Grant Date Fair Value, Ending Balance $ 24.60 $ 24.14 $ 27.32
Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance 105,929,000 100,828,000 136,298,000
Granted, Number of Shares 145,508,000 81,489,000 2,363,000
Vested, Number of Shares (111,703,000) (56,830,000) 0
Cancelled/forfeited, Number of Shares (30,575,000) (19,558,000) (37,833,000)
Outstanding, Ending Balance 109,159,000 105,929,000 100,828,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, beginning balance $ 26.92 $ 16.29 $ 16.59
Granted, Weighted Average Exercise Price $ 25.78 $ 42.72 $ 18.65
Vested, Weighted Average Exercise Price $ 7.96 $ 23.24 $ 0.00
Cancelled/forfeited, Weighted Average Grant Date Fair Value $ 42.11 $ 48.62 $ 17.53
Weighted Average Grant Date Fair Value, Ending Balance $ 40.55 $ 26.92 $ 16.29
Performance Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance 84,539,000 145,023,000 67,485,000
Granted, Number of Shares 32,498,000 0 91,378,000
Vested, Number of Shares (74,845,000) (57,948,000) 0
Cancelled/forfeited, Number of Shares (7,953,000) (2,536,000) (13,840,000)
Outstanding, Ending Balance 34,239,000 84,539,000 145,023,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted Average Grant Date Fair Value, beginning balance $ 39.78 $ 35.41 $ 27.53
Granted, Weighted Average Exercise Price $ 0.00 $ 0.00 $ 19.94
Vested, Weighted Average Exercise Price $ 31.17 $ 24.68 $ 0.00
Cancelled/forfeited, Weighted Average Grant Date Fair Value $ 49.20 $ 25.03 $ 20.12
Weighted Average Grant Date Fair Value, Ending Balance $ 49.20 $ 39.78 $ 35.41