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Fair Value of Financial Assets and Liabilities - Recurring (Details) - Fair Value, Measurements, Recurring [Member] - Significant Other Observable Inputs (Level 2) [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Assets:    
Deferred compensation investments in cash surrender life insurance $ 96 $ 92
Deferred compensation investments in mutual funds 21 21
Total 119 113
Liabilities:    
Deferred compensation plan liabilities 110 110
Total 114 113
Foreign Exchange Forward [Member]    
Assets:    
Foreign exchange contracts 2 0
Liabilities:    
Foreign derivative contracts $ 4 $ 3