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Incentive and Deferred Compensation Plans (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Total incentive and deferred compensation plans
     
Awards, employer match, and hypothetical earnings by plan:      
Total plan awards and earnings $ 18 $ 11 $ 13
Total plan awards paid (10) (8) (10)
Gross incentive plan and deferred compensation liabilities at end of period 33 26 24
Annual incentive plan
     
Awards, employer match, and hypothetical earnings by plan:      
Annual incentive plan awards 8 5 3
Long-term incentive plan
     
Awards, employer match, and hypothetical earnings by plan:      
Long-term incentive plan awards 8.0 5.0 9.0
Deferred compensation plans and Stock compensation plan for outside directors
     
Awards, employer match, and hypothetical earnings by plan:      
Deferred compensation plans, employer match, and hypothetical earnings 2 1 1
Compensation deferred under the plans 0 0 0
Distributions from the deferred compensation plans $ (1) $ (1) $ (1)