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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Dec. 31, 2017
AOCI Attributable to Parent [Abstract]  
Summary of Components and Changes of Accumulated Other Comprehensive Income (Loss)
The components and changes of Accumulated other comprehensive income (loss) for the three-month period ended December 31, 2017 were as follows:
(Millions of dollars)
Total
 
Foreign Currency
Translation
 
Benefit Plans
 

Cash Flow Hedges
 
Balance at September 30, 2017
$
(1,723
)
 
$
(1,001
)
 
$
(703
)
 
$
(18
)
 
Other comprehensive loss before reclassifications, net of taxes
(36
)
 
(36
)
 
—

 
—

 
Amounts reclassified into income, net of taxes
18

 
—

 
17

 
1

 
Balance at December 31, 2017
$
(1,740
)
 
$
(1,037
)
 
$
(686
)
 
$
(17
)