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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
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
2018

2017

2016

Employee Termination Benefits
 
 
 
Balance at January 1
$
62

$
111

$
308

Additions (reductions) charged to expense
5

20

160

Payments
(48
)
(69
)
(357
)
Balance at December 31
$
19

$
62

$
111

Allowance for Doubtful Accounts
 
 
 
Balance at January 1
$
606

$
487

$
429

Additions to expense
379

128

76

Bad debt write-offs
(5
)
(9
)
(18
)
Balance at December 31
$
980

$
606

$
487

Deferred Income Tax Valuation Allowance* 
 
 
 
Balance at January 1
$
16,574

$
16,069

$
15,412

Additions to deferred income tax expense
2,000

2,681

1,810

Reduction of deferred income tax expense
(2,601
)
(2,176
)
(1,153
)
Balance at December 31
$
15,973

$
16,574

$
16,069

 * See also Note 16 to the Consolidated Financial Statements, beginning on page 74.