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Supplementary Information (Tables)

12 Months Ended

Dec. 31, 2018

Cash Paid (Refunded) for Interest and Income Taxes

Cash paid (refunded) for interest and income taxes was as follows:

(Stated in millions)

	2018		2017			2016
Interest	$	592	$	572		$	599
Income tax	$	628	$	(44	)	$	750

Interest and Other Income

Interest and other income includes the following:

(Stated in millions)

	2018		2017		2016
Interest income	$	60	$	128	$	110
Earnings of equity method investments		89		96		90
	$	149	$	224	$	200

Change in Allowance for Doubtful Accounts

The change in Allowance for doubtful accounts is as follows:

(Stated in millions)

	2018			2017			2016
Balance at beginning of year	$	241		$	397		$	333
Additions		15			7			123
Amounts written off		(7	)		(163	)		(59	)
Balance at end of year	$	249		$	241		$	397

Accounts Payable and Accrued Liabilities

Revenue in excess of billings related to contracts where revenue is recognized over time was $0.2 billion and $0.3 billion at December 31, 2018 and 2017, respectively. Such amounts are included within Receivables less allowance for doubtful accounts in the Consolidated Balance Sheet.

Accounts payable and accrued liabilities consist of the following:

(Stated in millions)

	2018		2017
Trade	$	4,709	$	4,614
Payroll, vacation and employee benefits		1,244		1,296
Billings and cash collections in excess of revenue		877		752
Other		3,393		3,374
	$	10,223	$	10,036