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Post-employment benefits for associates (Details 4) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | $ 25,602 | $ 23,066 | $ 22,179
Plan assets, at fair value | 22,317 | 19,810 | 18,838
Funded status | 3,285 | 3,256 |
Pension plans | Unfunded |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 1,217 | 1,136 |
Pension plans | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 9,075 | 8,197 |
Pension plans | Deferred pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 3,109 | 2,722 |
Pension plans | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 13,418 | 12,147 |
Pension plans | Switzerland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 16,807 | 15,106 |
Plan assets, at fair value | 16,396 | 14,457 |
Funded status | (411) | (649) |
Pension plans | Switzerland | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 6,837 | 6,167 |
Pension plans | Switzerland | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 9,970 | 8,939 |
Pension plans | US |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 3,788 | 3,552 |
Plan assets, at fair value | 2,487 | 2,311 |
Funded status | (1,301) | (1,241) |
Pension plans | US | Unfunded |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 701 | 670 |
Pension plans | US | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 665 | 630 |
Pension plans | US | Deferred pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 1,290 | 1,205 |
Pension plans | US | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 1,833 | 1,717 |
Pension plans | Rest of the world |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 5,007 | 4,408 |
Plan assets, at fair value | 3,434 | 3,042 |
Funded status | (1,573) | (1,366) |
Pension plans | Rest of the world | Unfunded |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 516 | 466 |
Pension plans | Rest of the world | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 1,573 | 1,400 |
Pension plans | Rest of the world | Deferred pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 1,819 | 1,517 |
Pension plans | Rest of the world | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 1,615 | 1,491 |
Other post-employment benefit plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 632 | 746 | 1,073
Plan assets, at fair value | 89 | 134 | $ 119
Funded status | 543 | 612 |
Other post-employment benefit plans | Unfunded |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 543 | 612 |
Other post-employment benefit plans | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 105 | 157 |
Other post-employment benefit plans | Deferred pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 17 | 15 |
Other post-employment benefit plans | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 510 | 574 |
Other post-employment benefit plans | US |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 543 | 658 |
Plan assets, at fair value | 89 | 134 |
Funded status | (454) | (524) |
Other post-employment benefit plans | US | Unfunded |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 454 | 524 |
Other post-employment benefit plans | US | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 80 | 121 |
Other post-employment benefit plans | US | Deferred pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 17 | 15 |
Other post-employment benefit plans | US | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 446 | 522 |
Other post-employment benefit plans | Rest of the world |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 89 | 88 |
Plan assets, at fair value | 0 | 0 |
Funded status | (89) | (88) |
Other post-employment benefit plans | Rest of the world | Unfunded |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 89 | 88 |
Other post-employment benefit plans | Rest of the world | Active |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 25 | 36 |
Other post-employment benefit plans | Rest of the world | Deferred pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | 0 | 0 |
Other post-employment benefit plans | Rest of the world | Pensioners |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Defined benefit obligation, at present value | $ 64 | $ 52 |

X
- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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