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Fixed Assets - Summary of Fixed Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Property Plant And Equipment [Abstract]
Property, plant & equipment	$ 32,128	$ 35,009
Less: Accumulated depreciation	24,732	25,739
Fixed assets less accumulated depreciation	$ 7,396	$ 9,270

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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-Section S99
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-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- References

No definition available.

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Topic 944
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-Section S99
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-Subparagraph (SX 210.7-03(a)(8))
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