Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2020

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	2020		2019		2018
Employee Termination Benefits
Balance at January 1	$	7	$	19	$	62
Additions (reductions) charged to expense	859		6		5
Payments	(396)		(18)		(48)
Balance at December 31	$	470	$	7	$	19
Expected Credit Losses
Beginning allowance balance for expected credit losses	$	849	$	980	$	606
Current period provision	573		(128)		379
Write-offs charged against the allowance, if any	(751)		(3)		(5)
Recoveries of amounts previously written-off, if any	—		—		—
Balance at December 31	$	671	$	849	$	980
Deferred Income Tax Valuation Allowance1
Balance at January 1	$	15,965	$	15,973	$	16,574
Additions to deferred income tax expense2	2,892		1,336		2,000
Reduction of deferred income tax expense	(1,095)		(1,344)		(2,601)
Balance at December 31	$	17,762	$	15,965	$	15,973

1 See also Note 15 to the Consolidated Financial Statements, beginning on page 79.

2 Includes $974 of additions associated with the purchase of Noble.