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Other Assets Impairments, Restructuring and Other Items - Summary of Restructuring Accruals (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |
Beginning balance | $ (311) | $ (153)
Provision | (488) | (535)
Utilization and other | 566 | 377
Ending balance | (233) | (311)
Employee Termination [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning balance | (294) | (144)
Provision | (410) | (443)
Utilization and other | 500 | 293
Ending balance | (204) | (294)
Other Exit and Disposal [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Beginning balance | (17) | (9)
Provision | (78) | (92)
Utilization and other | 66 | 84
Ending balance | $ (29) | $ (17)

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- Definition Restructuring Accrual Provision + References No definition available. + Details
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- Definition Utilization and other. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |