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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2017
OTHER ASSETS.  
Other Assets

                                                                                                                                                                                    

($ millions)

 

Dec 31
2017

 

Dec 31
2016

 

Investments

 
224

 
191

 

Prepaids and other

 
987

 

1 057

 

 

 

1 211

 

1 248