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Net Interest And Other Financial Costs (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Income and Expenses [Abstract]        
Interest income $ (12) $ (26) $ (30) $ (71)
Interest expense 352 233 1,042 675
Interest capitalized (45) (21) (112) (55)
Pension and other postretirement non-service costs [1] 6 45 6 47
Loss on extinguishment of debt 0 0 0 4
Other financial costs 16 9 39 18
Net interest and other financial costs $ 317 $ 240 $ 945 $ 618
[1]
See Note 21.