Other Items (Tables)
 3 Months Ended
Mar. 31, 2018
Other Income and Expenses [Abstract]  
Net Interest And Other Financial Income (Costs)
Net interest and other financial costs were as follows:
 
Three Months Ended 
 March 31,
(In millions)
2018
 
2017
Interest income
$
(20
)
 
$
(5
)
Interest expense
213

 
163

Interest capitalized
(18
)
 
(15
)
Loss on extinguishment of debt
4

 
—

Other financial costs
4

 
6

Net interest and other financial costs
$
183

 
$
149