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Selected Quarterly Financial Data (Unaudited) (Details 3) (Former Chairman, Chief Executive Officer and President, USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2013
Former Chairman, Chief Executive Officer and President
   
Termination related charges    
Severance-related charges $ 26 $ 27
Accelerated deferred compensation on termination   17
Severance payments and other costs $ 9 $ 10