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Other (Income) Expense, Net - Schedule of Other (Income) Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Component of Other Income / Expense of Nonoperating [Line Items] |  |  |  |
Interest income |  | $ (36) | $ (59) | $ (274)
Interest expense |  | 806 | 831 | 893
Exchange losses |  | 297 | 145 | 187
Income from investments in equity securities, net |  | (1,940) | (1,338) | (170)
Net periodic defined benefit plan (credit) cost other than service cost |  | (212) | (339) | (545)
Other, net |  | (256) | (130) | 38
Other (income) expense, net |  | (1,341) | (890) | $ 129
Unrealized (loss) gains |  | $ (232) | $ 163 |
Forecast |  |  |  |
Component of Other Income / Expense of Nonoperating [Line Items] |  |  |  |
Unrealized (loss) gains | $ (500) |  |  |

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714 + Details
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