Severance and Facility Closure Costs (Detail) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 32
Charges Incurred	6
Cash Payments	(12)
Ending Balance	26
Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Charges Incurred	99
Termination benefits \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1
Charges Incurred	2
Ending Balance	3
Termination benefits \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	4
Ending Balance	4
Lease and contract obligations, accruals for facilities closures and other costs \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	16
Charges Incurred	1
Cash Payments	(4)
Ending Balance	13
Lease and contract obligations, accruals for facilities closures and other costs \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	9
Cash Payments	(4)
Ending Balance	5
Lease and contract obligations, accruals for facilities closures and other costs \| Acquisition related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	2
Charges Incurred	3
Cash Payments	(4)
Ending Balance	$ 1

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
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