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Employee benefits - Underfunded pension plans - Assets by category (Details) - Underfunded pension plans - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets by category |  |
Cash and cash equivalents | $ 102 | $ 56
Equity securities | 1,565 | 1,411
Real estate | 5 | 55
Loans to participants | 2 | 3
Others | 179 | 167
Total | 3,991 | 3,726
Level 1 |  |
Assets by category |  |
Equity securities | 1,565 | 1,409
Others |  | 2
Total | 1,735 | 1,618
Level 2 |  |
Assets by category |  |
Cash and cash equivalents | 102 | 56
Equity securities |  | 2
Total | 1,819 | 1,673
Level 3 |  |
Assets by category |  |
Real estate | 5 | 55
Loans to participants | 2 | 3
Others | 179 | 165
Total | 437 | 435
Corporate |  |
Assets by category |  |
Debt securities | 519 | 507
Corporate | Level 2 |  |
Assets by category |  |
Debt securities | 519 | 507
Government |  |
Assets by category |  |
Debt securities | 822 | 790
Government | Level 1 |  |
Assets by category |  |
Debt securities | 132 | 156
Government | Level 2 |  |
Assets by category |  |
Debt securities | 690 | 634
Fixed income |  |
Assets by category |  |
Investments funds | 194 | 388
Fixed income | Level 1 |  |
Assets by category |  |
Investments funds | 36 | 49
Fixed income | Level 2 |  |
Assets by category |  |
Investments funds | 158 | 339
Investments in equity securities |  |
Assets by category |  |
Investments funds | 351 | 137
Investments in equity securities | Level 1 |  |
Assets by category |  |
Investments funds | 1 | 2
Investments in equity securities | Level 2 |  |
Assets by category |  |
Investments funds | 350 | 135
Private Equity funds |  |
Assets by category |  |
Structured investments | 250 | 212
Private Equity funds | Level 3 |  |
Assets by category |  |
Structured investments | $ 250 | $ 212

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- Definition The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_c&doctype=Standard -URIDate 2020-01-01 + Details
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