Severance and Facility Closure Costs (Detail) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 66
Charges Incurred	40
Cash Payments	(68)
Ending Balance	38
Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Charges Incurred	90
Termination benefits \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	5
Charges Incurred	1
Cash Payments	(4)
Ending Balance	2
Termination benefits \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	8
Charges Incurred	26
Cash Payments	(27)
Ending Balance	7
Lease and contract obligations, accruals for facilities closures and other costs \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	40
Charges Incurred	4
Cash Payments	(24)
Ending Balance	20
Lease and contract obligations, accruals for facilities closures and other costs \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	13
Charges Incurred	9
Cash Payments	(13)
Ending Balance	$ 9

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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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
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 420
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