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Pension and Postretirement Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan expenses $ 67 $ 72 $ 78
Multi-employer plan contribution 8 $ 29 $ 22
Funded amount of nonqualified deferred compensation program 8    
International Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Estimated employer contributions in next fiscal year $ 41