Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Numerator:
Net income attributable to stockholders		$ 123		$ 5		$ 82		$ 96		$ 54		$ 52		$ 216		$ 150		$ 306	[1]	$ 472	[1]	$ 2,625	[1]
Earnings allocated to participating securities																		(1)		(2)		(8)
Net income attributable to stockholders, net of earnings allocated to participating securities																		$ 305		$ 470		$ 2,617
Denominator:
Weighted average shares outstanding – basic																		212		203		211
Unvested restricted shares																		1		1
Net effect of shares issued with respect to E&P Dividend	[2]																					3
Weighted average shares outstanding – diluted																		213		204		214
Basic EPS		$ 0.51	[3]	$ 0.02	[3]	$ 0.40	[3]	$ 0.48	[3]	$ 0.27	[3]	$ 0.26	[3]	$ 1.07	[3]	$ 0.71	[3]	$ 1.44	[3],[4]	$ 2.32	[3],[4]	$ 12.38	[4]
Diluted EPS		$ 0.51	[3]	$ 0.02	[3]	$ 0.40	[3]	$ 0.48	[3]	$ 0.27	[3]	$ 0.26	[3]	$ 1.07	[3]	$ 0.71	[3]	$ 1.44	[3],[4]	$ 2.31	[3],[4]	$ 12.21	[4]

[1] Includes the derecognition and remeasurement of deferred tax assets and liabilities for the year ended December 31, 2017 of $2,347 million associated with our intent to be taxed as a REIT.

[2] Shares issued in connection with the distribution of our C corporation earnings and profits attributable to the period prior to spin-off “E&P Dividend”).

[3] Per share amounts are calculated based on unrounded numbers and are calculated independently for each period presented, therefore, the sum of the quarterly EPS does not necessarily equal the EPS for the full year.

[4] Per share amounts are calculated based on unrounded numbers.