Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	[1]
Earnings Per Share [Abstract]
Weighted average shares outstanding - basic		202	198
Net effect of shares issued with respect to E&P Dividend	[2]	11
Weighted average shares outstanding - diluted		213	198
Net income attributable to stockholders	[3]	$ 2,350	$ 22
Basic EPS	[4]	$ 11.65	$ 0.11
Diluted EPS	[4]	$ 11.02	$ 0.11

[1] For 2016, basic and diluted earnings per share were calculated using the number of shares of common stock outstanding upon the completion of the spin-off.

[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] Includes the derecognition of approximately $2.3 billion of deferred tax liabilities during the three months ended March 31, 2017.

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