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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The following table summarizes the difference between income tax expense (benefit) at the U.S. statutory rate of 21% and the income tax expense (benefit) at effective worldwide tax rates for the respective periods:


Three Months Ended June 30,

Six Months Ended June 30,
Millions of dollars

2020

2019

2020
 
2019
Earnings before income taxes

$
43


$
202


$
261


$
544










Income tax expense computed at United States statutory tax rate
 
9

 
42

 
55

 
114

Valuation allowances
 
5

 
39

 
6

 
(196
)
Audits and settlements
 
5

 
(13
)
 
17

 
(13
)
U.S. foreign income items, net of credits
 
(2
)
 
4

 
1

 
11

Changes in enacted tax rates
 

 
25

 

 
25

Other
 
1

 
33

 
10

 
57

Income tax expense (benefit) computed at effective worldwide tax rates

$
18


$
130


$
89


$
(2
)