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Supplemental Disclosures (Tables)
 12 Months Ended
Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]  
Additional information concerning acquisitions, interest and income taxes paid
The following schedule provides additional information concerning acquisitions, interest and income taxes paid:
(In millions of dollars)
2019

 
2018

 
2017

Assets acquired, excluding cash
$
8,655

 
$
1,100

 
$
898

Liabilities assumed
(2,804
)
 
(83
)
 
(134
)
Non-controlling interests assumed
(280
)
 
—

 
—

Contingent/deferred purchase consideration
(66
)
 
(133
)
 
(109
)
Net cash outflow for acquisitions
$
5,505

 
$
884

 
$
655

(In millions of dollars)
2019

 
2018

 
2017

Interest paid
$
427

 
$
264

 
$
199

Income taxes paid, net of refunds
$
661

 
$
632

 
$
583
Analysis of allowance for doubtful accounts
An analysis of the allowance for doubtful accounts is as follows:
For the Years Ended December 31,
(In millions of dollars)
2019

 
2018

 
2017

Balance at beginning of year
$
112

 
$
110

 
$
96

Provision charged to operations
32

 
34

 
31

Accounts written-off, net of recoveries
(16
)
 
(24
)
 
(17
)
Effect of exchange rate changes and other
12

 
(8
)
 
—

Balance at end of year
$
140

 
$
112

 
$
110