Supplementary Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Cash Paid (Refunded) for Interest and Income Taxes

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

(Stated in millions)
	2017			2016		2015
Interest	$	572		$	599	$	346
Income tax	$	(44	)	$	750	$	1,567

Interest and Other Income

Interest and other income includes the following:

(Stated in millions)
	2017		2016		2015
Interest income	$	128	$	110	$	52
Earnings of equity method investments		96		90		184
	$	224	$	200	$	236

Change in Allowance for Doubtful Accounts

The change in Allowance for doubtful accounts is as follows:

(Stated in millions)
	2017			2016			2015
Balance at beginning of year	$	397		$	333		$	275
Additions		7			123			75
Amounts written off		(163	)		(59	)		(17	)
Balance at end of year	$	241		$	397		$	333

Accounts Payable and Accrued Liabilities

Revenue in excess of billings related to contracts accounted for under the percentage-of-completion method was $0.3 billion and $0.5 billion at December 31, 2017 and 2016, respectively.

Accounts payable and accrued liabilities are summarized as follows:

(Stated in millions)
	2017		2016
Payroll, vacation and employee benefits	$	1,296	$	1,349
Trade		4,614		4,004
Deferred revenue		752		1,088
Other		3,374		3,575
	$	10,036	$	10,016