Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent [Member]
Common Stock, Shares, Issued	201,363,345
Common Stock, Value, Issued	$ 2
Treasury Stock, Shares	(1,658,476)
Treasury Stock, Value	$ (59)
Additional Paid in Capital	3,303
Retained Earnings (Accumulated Deficit)	(1,838)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0
Stock Issued During Period, Shares, New Issues		0
Stock Issued During Period, Value, New Issues	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0			$ 0
BOP Stockholders' Equity Balance at Dec. 31, 2017	1,408
EOP Stockholders' Equity Balance at Mar. 31, 2018	1,505
Stock-based compensation	13			13
Treasury stock, net, shares			0
Treasury Stock, Value, Acquired, Cost Method	(1)		$ (1)	$ 0
Net income (loss)	86				$ 86
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (1)					$ (1)
Common Stock, Shares, Issued	201,418,445
Common Stock, Value, Issued	$ 2
Treasury Stock, Shares	(1,692,409)
Treasury Stock, Value	$ (60)
Additional Paid in Capital	3,316
Retained Earnings (Accumulated Deficit)	(1,752)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (1)