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Supplementary Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Cash Paid (Refunded) for Interest and Income Taxes | Cash paid for interest and income taxes was as follows:
(Stated in millions) |
| 2020 |  |  | 2019 |  |  | 2018 |
Interest | $ | 598 |  |  | $ | 558 |  |  | $ | 592 |
Income tax | $ | 582 |  |  | $ | 739 |  |  | $ | 628 |
Interest and Other Income | Interest and other income includes the following:
(Stated in millions) |
| 2020 |  |  | 2019 |  |  | 2018 |
Earnings of equity method investments | $ | 91 |  |  | $ | 45 |  |  | $ | 89 |
Interest income |  | 33 |  |  |  | 41 |  |  |  | 60 |
Unrealized gain on marketable securities (see Note 3) |  | 39 |  |  |  | - |  |  |  | - |
| $ | 163 |  |  | $ | 86 |  |  | $ | 149 |
Change in Allowance for Doubtful Accounts | The change in Allowance for doubtful accounts is as follows:
(Stated in millions) |
| 2020 |  |  | 2019 |  |  | 2018 |
Balance at beginning of year | $ | 255 |  |  | $ | 249 |  |  | $ | 241 |
Additions |  | 58 |  |  |  | 5 |  |  |  | 15 |
Amounts written off |  | (12 | ) |  |  | 1 |  |  |  | (7 | )
Balance at end of year | $ | 301 |  |  | $ | 255 |  |  | $ | 249 |
Accounts Payable and Accrued Liabilities | Revenue in excess of billings related to contracts where revenue is recognized over time was $0.2 billion at both December 31, 2020 and 2019. 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) |
| 2020 |  |  | 2019 |
Trade | $ | 2,937 |  |  | $ | 4,790 |
Payroll, vacation and employee benefits |  | 1,524 |  |  |  | 1,445 |
Billings and cash collections in excess of revenue |  | 941 |  |  |  | 910 |
Other |  | 3,040 |  |  |  | 3,518 |
| $ | 8,442 |  |  | $ | 10,663 |

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