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Compensation and Benefit Plans (Supplemental Stock-Based Compensation) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (benefit) $ 3 [1] $ 7 [1] $ 7 [1]
Income tax benefits related to stock compensation expense 1 3 3
Excess tax benefits 3 5 2
Weighted average grant date fair value per option granted (in dollars per share) $ 0.00 $ 5.22 $ 5.61
Fair value of options vested 3 3 3
Cash used to purchase shares to settle options 45 44 18
Cash from participants to exercise stock options 32 26 12
Value of options exercised 13 18 6
Tax benefit from options exercised 5 6 2
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (benefit) 2 [1] 3 [1] 2 [1]
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (benefit) 0 [1] 1 [1] 1 [1]
Restricted Stock Units
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (benefit) 1 [1] 1 [1] 2 [1]
Weighted average grant date fair value per share granted $ 0.00 $ 43.16 $ 38.03
Value of shares settled 1.3 1.0 2.0
Tax benefits realized from settlements of awards 0.5 0 1.0
Other Stock Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense (benefit) 0 [1] 2 [1] 2 [1]
Performance shares classified as equity awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share granted $ 0.00 [2] $ 51.41 [2] $ 31.14 [2]
Fair value of shares vested 0.8 [2] 1.4 [2] 0.8 [2]
Value of shares settled 0 0.7 0
Tax benefits realized from settlements of awards 0 0 0
Performance shares classified as liability awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Value of shares settled 0 0.7 0
Tax benefits realized from settlements of awards $ 0 $ 0 $ 0
[1] Reflected in administration and general on the consolidated statements of operations.
[2] The performance shares awarded in 2011 will be paid during 2014 as performance targets were met.