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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements  
Supplemental Cash Flow Information

 

 

 

 

 

 

 

 

 

 

 

(Millions)

    

2017

    

2016

    

2015

 

Cash income tax payments, net of refunds

 

$

1,604

 

$

1,888

 

$

2,331

 

Cash interest payments

 

 

214

 

 

194

 

 

134