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Restructuring and Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
Restructuring Reserve [Roll Forward] |  |  |
Additional restructuring and related costs | $ 39 | $ 345 |
Various 2023 Restructuring Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Additional restructuring and related costs | 39 |  | $ 276
Utilized—cash | (38) |  | (130)
Utilized—noncash | (9) |  | (41)
Restructuring reserve, ending balance | 97 |  | 105
Employee Severance and Termination Benefits | Various 2023 Restructuring Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Additional restructuring and related costs | 29 |  | 204
Utilized—cash | (38) |  | (111)
Utilized—noncash | 0 |  | 0
Restructuring reserve, ending balance | 84 |  | 93
Long-Lived Asset Impairments | Various 2023 Restructuring Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Additional restructuring and related costs | 9 |  | 38
Utilized—cash | 0 |  | 0
Utilized—noncash | (9) |  | (38)
Restructuring reserve, ending balance | 0 |  | 0
Other | Various 2023 Restructuring Plans |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Additional restructuring and related costs | 1 |  | 34
Utilized—cash | 0 |  | (19)
Utilized—noncash | 0 |  | (3)
Restructuring reserve, ending balance | $ 13 |  | $ 12

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-17 + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease in the reserve for full or partial settlement through consideration other than cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 + Details
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