Severance and Facility Closure Costs (Detail) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 32
Charges Incurred	9
Cash Payments	(20)
Ending Balance	21
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	4
Cash Payments	(2)
Ending Balance	3
Termination benefits \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	4
Cash Payments	(2)
Ending Balance	2
Lease and contract obligations, accruals for facilities closures and other costs \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	18
Charges Incurred	5
Cash Payments	(10)
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	(6)
Ending Balance	$ 3

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.

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