v3.20.4

Postretirement Benefit Plans - Summary of Changes in Pension Benefit Obligations and Defined-Benefit Pension Plan Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Service cost | $ 17 | $ 14 | $ 16
Interest cost | 7 | 12 | 12
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at end of year | 224 |  |
Pension Plan |  |  |
Defined Benefit Plan, Roll Forwards [Abstract] |  |  |
Projected benefit obligation at beginning of year | 665 | 617 |
Service cost | 17 | 14 |
Interest cost | 7 | 12 |
Actuarial (gains) and losses | 65 | 50 |
Curtailments and settlements | 0 | 0 |
Benefits paid | (22) | (23) |
Exchange rate differences | 58 | (5) |
Projected benefit obligation at end of year | 790 | 665 | 617
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Defined Benefit Plan, Plan Assets, Amount, Beginning Balance | 203 | 201 |
Actual return on plan assets | 5 | 5 |
Employer contributions | 22 | 22 |
Curtailments and settlements | 0 | 0 |
Benefits paid | (22) | (23) |
Exchange rate differences | 16 | (2) |
Fair value of plan assets at end of year | 224 | 203 | 201
Funded status | (566) | (462) |
Classification of the funded status is as follows |  |  |
– Accrued pension cost within other non-current liabilities | (554) | (452) |
– Accrued pension cost within accrued liabilities | (12) | (10) |
Total | (566) | (462) |
Accumulated benefit obligation for all Company-dedicated benefit pension plans | 755 | 621 |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Total AOCI at beginning of year | 140 | 94 |
Net actuarial loss (gain) | 58 | 47 |
Exchange rate differences | 16 | (1) |
Total AOCI at end of year | 214 | 140 | $ 94
Funded Plan | Pension Plan |  |  |
Plans with assets less than accumulated benefit obligation (including unfunded plans) |  |  |
Fair value of plan assets | 220 | 198 |
Accumulated benefit obligations | $ 750 | $ 617 |

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- Definition Defined benefit plan recognized net gain loss due to settlements and curtailments plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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