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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (2,871) | $ (2,788) | $ (2,599) | $ (2,350)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (407) | (357) |  |
Other Comprehensive Income (Loss), Before Reclassifications, Tax | 131 | (97) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 4 | 16 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (272) | (438) |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | 1 | 7 |  |
Tax cost related to unrealized currency translation adjustments other than translation of foreign denominated balance sheets | 40 | (27) |  |
Pension and other postretirement benefit adjustments, tax cost | 1 |  |  |
Accumulated Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | (1,934) | (2,074) | (1,663) | (1,627)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (402) | (357) |  |
Other Comprehensive Income (Loss), Before Reclassifications, Tax | 131 | (90) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (271) | (447) |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | (938) | (715) | (937) | (724)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (5) | 0 |  |
Other Comprehensive Income (Loss), Before Reclassifications, Tax | 0 | (7) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 4 | 16 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (1) | 9 |  |
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Accumulated other comprehensive loss | 1 | 1 | $ 1 | $ 1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | 0 | 0 |  |
Other Comprehensive Income (Loss), Before Reclassifications, Tax | 0 | 0 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 0 | $ 0 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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