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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II — Valuation and Qualifying Accounts
 
Year ended December 31
 
Millions of Dollars
2019

2018

2017

Employee Termination Benefits
 
 
 
Balance at January 1
$
19

$
62

$
111

Additions (reductions) charged to expense
6

5

20

Payments
(18
)
(48
)
(69
)
Balance at December 31
$
7

$
19

$
62

Allowance for Doubtful Accounts
 
 
 
Balance at January 1
$
980

$
606

$
487

Additions (reductions)
(128
)
379

128

Bad debt write-offs
(3
)
(5
)
(9
)
Balance at December 31
$
849

$
980

$
606

Deferred Income Tax Valuation Allowance* 
 
 
 
Balance at January 1
$
15,973

$
16,574

$
16,069

Additions to deferred income tax expense
1,336

2,000

2,681

Reduction of deferred income tax expense
(1,344
)
(2,601
)
(2,176
)
Balance at December 31
$
15,965

$
15,973

$
16,574

 * See also Note 15 to the Consolidated Financial Statements, beginning on page 74.