Acquisitions and Divestitures - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) Hotel	Dec. 31, 2015 USD ($) Hotel	Dec. 31, 2014 USD ($) Property Hotel
Business Acquisition [Line Items]
Number of remaining natural gas and oil properties | Property				0
Purchase price		$ 79	$ 157	$ 448
Bluegrass Project [Member]
Business Acquisition [Line Items]
Previous period capitalized costs recorded as charge in present period in other operating expenses, net of tax and noncontrolling interest				55
Bluegrass Project [Member] | Other Operating Expenses [Member]
Business Acquisition [Line Items]
Previous period capitalized costs recorded as charge in present period in other operating expenses				$ 94
Evangeline Pipeline System [Member]
Business Acquisition [Line Items]
Purchase price	$ 295
CAC [Member]
Business Acquisition [Line Items]
Percentage of coinsurance agreement				100.00%
Recognized loss due to difference between market value and book value of funds withheld assets				$ 31
Boardwalk Pipeline Partners, LP [Member] | Bluegrass Project [Member]
Business Acquisition [Line Items]
Previous period capitalized costs recorded as charge in present period in other operating expenses				10
Loews Hotels [Member]
Business Acquisition [Line Items]
Amount paid for acquisition, funded with cash and property-level debt		$ 84	$ 330	$ 230
Number of hotel properties acquired | Hotel		1	2	3