Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating leases
Operating lease right-of-use assets	$ 378		$ 393
Total operating lease liabilities	469		480
Finance leases
Property, plant and equipment, net	426		466
Other intangible assets, gross	6,408		6,310
Accumulated amortization	(3,523)		(3,350)
Other intangible assets, net	4,806		4,881
Accounts payable and other current liabilities	1,077		1,182
Long-term debt and capital lease obligations	7,359		7,395
Total finance lease liabilities	136		145
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	(2)	$ (2)
Operating cash flows from operating leases	(32)	(28)
Financing cash flows from finance leases	(11)	(16)
Right-of-use assets obtained in exchange for new finance lease liabilities	2	8
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 23	$ 30
Weighted-average remaining lease term--finance leases	4 years	4 years
Weighted-average remaining lease term--operating leases	8 years	10 years
Weighted-average discount rate--finance leases	6.07%	4.58%
Weighted-average discount rate--operating leases	4.14%	4.55%
Finance Leases
Finance leases
Property, plant and equipment, gross	$ 390		393
Accumulated depreciation	(224)		(213)
Property, plant and equipment, net	166		180
Other intangible assets, gross	23		24
Accumulated amortization	(15)		(13)
Other intangible assets, net	8		11
Accounts payable and other current liabilities	52		53
Long-term debt and capital lease obligations	84		92
Other Current Liabilities
Operating leases
Total operating lease liabilities	105		110
Operating Lease Liabilities
Operating leases
Total operating lease liabilities	$ 364		$ 370