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Supplementary Information | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Supplementary Information | 18. Supplementary Information 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 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 |
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 |
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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