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Supplementary Data (Unaudited) Supplementary Data (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
SUPPLEMENTARY QUARTERLY DATA (UNAUDITED)
Millions of dollars, except per share amounts
 
2017
 
 
1st
 
2nd
 
3rd
 
4th
 
Year
Revenues
 
$
2,922

 
$
2,969

 
$
3,035

 
$
3,166

 
$
12,093

Gross Profit
 
1,452

 
1,432

 
1,504

 
1,554

 
5,942

Net Income (Loss)
 
562

 
344

 
(132
)
 
327

 
1,100

Earnings per Share:
 
 
 
 
 
 
 
 
 
 
Basic
 
2.64

 
1.61

 
(0.75
)
 
1.27

 
4.70

Diluted
 
2.58

 
1.58

 
(0.75
)
 
1.24

 
4.60

 
 
2016
 
 
1st
 
2nd
 
3rd
 
4th
 
Year
Revenues
 
$
2,986

 
$
3,067

 
$
3,198

 
$
3,231

 
$
12,483

Gross Profit
 
1,408

 
1,484

 
1,547

 
1,552

 
5,991

Net Income
 
229

 
338

 
390

 
19

 
976

Earnings per Share:
 
 
 
 
 
 
 
 
 
 
Basic
 
1.08

 
1.59

 
1.83

 
0.09

 
4.59

Diluted
 
1.06

 
1.56

 
1.80

 
0.09

 
4.49