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Share-Based Compensation Plans Share-Based Compensation Plans (Schedule of Summary of Performance Restricted Stock Units) (Details) (Performance Restricted Stock Units [Member], USD $)
12 Months Ended
Dec. 31, 2012
Performance Restricted Stock Units [Member]
 
Nonvested, beginning balance, restricted stock and units 1,021,000 [1]
Granted, restricted stock and units 1,998,000
Vested, restricted stock and units 0
Forfeited, restricted stock and units (110,000)
Nonvested, ending balance, restricted stock and units 2,909,000 [1]
Nonvested, beginning balance, weighted-average grant- date fair value $ 27.72
Granted, weighted-average grant-date fair value $ 19.45
Vested, weighted-average grant-date fair value $ 0
Forfeited, weighted average grant-date fair value $ 23.80
Nonvested, ending balance, weighted-average grant-date fair value $ 22.19
[1] (1) Based on target payout