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Severance Costs (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Severance Costs.        
Severance costs $ 13 $ 4 $ 24 $ 16
Severance costs relating to corporate office actions $ 13   $ 20