Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, $ in Millions				3 Months Ended								12 Months Ended
	Jun. 29, 2018 USD ($) $ / shares	May 22, 2018 USD ($)	May 22, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Hotel Acquisition	Dec. 31, 2017 USD ($) Hotel	Dec. 31, 2016 USD ($) Hotel
Business Acquisition [Line Items]
Purchase of Boardwalk Pipeline common units												$ (1,718)		$ (9)
Revenue				$ 3,287	$ 3,608	$ 3,590	$ 3,581	$ 3,555	$ 3,521	$ 3,359	$ 3,300	14,066	$ 13,735	13,105
Estimated goodwill recognized				665				$ 659				665	659	346
Additional Paid-in Capital [Member]
Business Acquisition [Line Items]
Purchase of Boardwalk Pipeline common units												658		3
Accumulated Other Comprehensive Income (Loss) [Member]
Business Acquisition [Line Items]
Purchase of Boardwalk Pipeline common units												(29)
Corporate [Member]
Business Acquisition [Line Items]
Revenue												857	645	149
Corporate [Member] | Consolidated Container [Member]
Business Acquisition [Line Items]
Revenue												868	498
Boardwalk Pipeline [Member]
Business Acquisition [Line Items]
Increase to deferred income tax liabilities												213
Boardwalk Pipeline [Member] | Additional Paid-in Capital [Member]
Business Acquisition [Line Items]
Purchase of Boardwalk Pipeline common units												658
Boardwalk Pipeline [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Business Acquisition [Line Items]
Purchase of Boardwalk Pipeline common units												(29)
CCC Acquisition Holdings, Inc. [Member]
Business Acquisition [Line Items]
Payments for acquisition			$ 1,200
Cash payments funding acquisition		$ 620
Goodwill deductible for tax purposes			94
Estimated goodwill recognized			$ 310
CCC Acquisition Holdings, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Useful life of intangible assets			21 years
CCC Acquisition Holdings, Inc. [Member] | Trade Name [Member]
Business Acquisition [Line Items]
Useful life of intangible assets			10 years
Plastic Packaging Manufacturers Business Acquisition [Member]
Business Acquisition [Line Items]
Payments for acquisition												40
Boardwalk Gp Lp [Member] | Boardwalk Pipeline [Member] | Subsidiaries [Member]
Business Acquisition [Line Items]
Payments for acquisition	$ 1,500
Purchase price, per unit | $ / shares	$ 12.06
Consolidated Container [Member]
Business Acquisition [Line Items]
Debt financing proceeds funding acquisition		$ 600
Consolidated Container [Member] | Plastic Packaging Manufacturers Business Acquisition [Member]
Business Acquisition [Line Items]
Estimated goodwill recognized				10								$ 10
Number of businesses acquired | Acquisition												3
Consolidated Container [Member] | Plastic Packaging Manufacturers Business Acquisition [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Estimated intangible assets recognized				$ 15								$ 15
Loews Hotels And Co [Member]
Business Acquisition [Line Items]
Payments for acquisition														$ 84
Number of hotel properties acquired | Hotel														1
Proceeds from sale of hotels												$ 40	$ 31
Number of hotel properties sold | Hotel												1	2