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Postretirement Benefit Plans (Rollforward of Fair Value Measurements) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning Balance $ 559  
Ending Balance 562 $ 559
Hedge funds    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning Balance 181  
Ending Balance 178 181
Private equity    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning Balance 17  
Ending Balance 13 17
Other | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning Balance 25 17
Purchases, sales, settlements 1 2
Net transfers   (7)
Impact on currency (2) (1)
Ending Balance $ 24 $ 25