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Stock Options and Other Stock Based Compensation (Details)-K - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options and Other Stock Based Compensation      
Shares available for grants under the plans 8,892,000    
Compensation cost for all grants of shares and units $ 15 $ 21 $ 11
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of options may be exercised in whole or in part during the first year after the date granted 56,000    
Stock Options | Shares granted to employees after March 21, 2005      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of options exercisable per year beginning on the first anniversary from date of option granted 25.00%